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BI Tango

Tango is the consumer and micro-business brand of Proximus Luxembourg, offering a thin cloud PBX called Tango Fix4Bizz at €9.90 per workstation per month. It fits self-employed and very small offices that need basic landline features plus mobile convergence. Larger or feature-hungry buyers are routed inside the group to Proximus NXT, which leaves an opening for Mixvoip on SMEs of 10 to 200 users that want enterprise features without enterprise complexity.

Part 1: Sales-ready intelligence

A. Sales battle card

Elevator pitch. Tango Fix4Bizz is a low-cost, single-tier cloud telephone exchange for very small Luxembourg companies, sold by a mass-market consumer operator whose business focus is fibre and mobile bundles. Anything beyond a basic landline replacement is officially out of scope for the Tango brand and handed off internally to Proximus NXT (formerly Telindus).
Top 3 differentiators in our favour
  • Feature depth: real IVR, call queues, call recording, analytics, full Microsoft Teams integration and CRM integrations on Voxbi/Mixvoip versus a published Tango feature list of seven basic items.
  • Scope match: Mixvoip is built and staffed for SMEs of 10 to 200 users, the segment Tango explicitly excludes (Tango brand is scoped to fewer than 10 employees).
  • Independent of access: Mixvoip works over any internet line in Luxembourg, Belgium, France and Germany, while Tango Fix4Bizz is best on Tango fibre and primarily a Luxembourg-only landline product.
Top 3 differentiators in their favour (honest)
  • Price entry point: €9.90 per workstation per month is one of the lowest public Cloud PBX prices in Luxembourg.
  • Network ownership and brand recognition: Tango is Luxembourg's second mobile network operator and has 25-plus years of brand presence, with around 280,000 customers across all services.
  • One-bill convenience: Tango can sell fibre, mobile and the cloud telephone exchange under a single Business Pack with a single invoice.
Three pre-approved zingers
  • "Fix4Bizz is a landline replacement, not a phone system. Read the seven features on their own page."
  • "Tango stops at ten employees. After that, the same group sells you Proximus NXT, with a different team, a different contract and a different price book."
  • "€9.90 buys a station, not call recording, not a queue, not a Teams number, not an API."
Three things never to say
  • "Tango is bad at telephony." Their landline service works; the limit is scope, not quality.
  • "Proximus is foreign." Proximus Luxembourg is a Luxembourg-registered SA with a Luxembourg data centre footprint and ILR-notified status.
  • "They will go away." They are part of a Belgian state-majority group with deep pockets; the brand is not at financial risk.
Walk-away signals
  • Prospect has fewer than five employees, only needs voicemail and forwarding, and is on Tango fibre already with a long term left.
  • Prospect's only requirement is the cheapest possible landline replacement and they have no plans for IVR, queues, recording, CRM integration or Teams.
  • Prospect is already a Proximus NXT enterprise customer with a managed contract and dedicated account team; the buying motion is very different there.

B. Discovery question bank

Cost discovery
  1. What is the all-in monthly cost per user on your current Tango quote, including the landline, the Pack Communication Fixe, the Bizz2Go option, the modem rental and the activation fee?
  1. How does that compare to your last 12 months of actual call charges to mobile and international destinations, since Fix4Bizz prices outbound by the minute outside the Pack?
  1. What did Tango quote for hardware (Yealink T42U/T46U/T48U or DECT) and is that a purchase, a lease or a sunk cost?
  1. What is the contract length being proposed and what is the early-exit penalty if you grow past the Tango brand scope?
Feature discovery
  1. Does your team need to record calls for training, compliance or dispute resolution?
  1. Do you need menu-driven IVR ("press 1 for sales") or call queues with hold music and reporting?
  1. Do you want incoming calls to pop the caller's record in a CRM like HubSpot, Salesforce, Pipedrive, Odoo or Microsoft Dynamics?
  1. Will users live inside Microsoft Teams and need to make and receive landline calls from Teams without a separate softphone?
  1. Do you need real-time dashboards or end-of-day analytics on missed calls, queue performance or peak hours?
  1. How many sites or home-working employees need a number, and do any of them work cross-border in Belgium, France or Germany?
Operational discovery
  1. Who in your company is the day-to-day administrator, and how often do you need to add, remove or reassign numbers and users?
  1. What is your tolerance for downtime, and what SLA, if any, has been put in writing in your quote?
  1. How is support delivered when something goes wrong: a ticket form, a generic helpline, or a named account manager?
  1. What happens to your numbers, hardware and configuration if you decide to switch providers in two years?
Strategic discovery
  1. Do you expect to grow past 10 employees in the next 24 to 36 months, and have you been told what happens to your Fix4Bizz contract at that point?

C. Objection handling matrix

Objection
Why they say it
Underlying concern
Calibrated response
Proof point
"Tango is only €9.90 per user, you're more expensive."
Headline price comparison without bundle math.
They do not want to overpay.
We hear that often. Has your Tango quote included Pack Communication, Bizz2Go, the modem and per-minute charges to mobiles and abroad? If we model the same 12 months of real usage side by side, where do you think the gap actually lands?
Tango's own Pack Communication Fixe page lists it as an add-on, not included; Fix4Bizz lists per-minute outbound charges outside the Pack.
"We're already on Tango fibre, easier to add Fix4Bizz."
Single-vendor convenience.
Procurement friction.
That is a real benefit, no argument. Would it still make sense if your phone system can stay independent of which fibre you use today and which one you use in two years?
Mixvoip Cloud PBX runs over any compliant Luxembourg or Greater Region internet line.
"Tango is the local operator, they know Luxembourg."
Trust in a national brand.
Local accountability if things go wrong.
Proximus Luxembourg is local, that is true. Mixvoip is also Luxembourg-headquartered and ILR-notified. The question is whether the team you call when something breaks is dedicated to your phone system or shared with the consumer support queue. What is your read on the support model in your Tango quote?
Tango's published support is a general business helpline and the standard 24/7 line; Mixvoip publishes a dedicated business support model.
"We will just add features later if we need them."
Avoiding upfront complexity.
Fear of paying for unused capability.
That is reasonable. The thing to check is whether the features you might need later are actually on the roadmap of the platform you are signing today. Where do you see Fix4Bizz adding recording, queues or Teams integration?
Tango Fix4Bizz public feature list, as of May 11, 2026, contains only voice reception, absence management, voicemail, directory, pickup group, forwarding and cascade.
"We only need basic landline features."
Genuine simple needs.
They want to be sure they are not being upsold.
Understood. If the need is truly only voicemail and forwarding for a team of four, Fix4Bizz can do that. Could we agree what would have to change in your business for that not to be enough?
Realistic, no counter-argument required.
"Tango has 280,000 customers, you must be much smaller."
Size as proxy for reliability.
Will the provider still be there in 5 years?
That figure includes mostly residential mobile and TV customers; the Tango brand is officially scoped to companies under 10 employees. The relevant comparison is how many Luxembourg businesses run their PBX on each platform, and how many of those are companies the size of yours. Would that data change your view?
Tango brand mission statement on proximus.lu and devex.com explicitly limits Tango to consumer plus sub-10-employee businesses.
"We use Microsoft Teams already."
Existing collaboration tool.
They want a phone system that fits Teams.
Then the key question is whether your phone system can put a real Luxembourg number on your Teams user, with calling from inside Teams. There is no public evidence Tango Fix4Bizz integrates with Teams Phone today. How important is that for your team?
Microsoft Learn lists certified SIP gateway and Direct Routing providers; Tango Fix4Bizz is not among them as of May 11, 2026.
"We do not need call recording."
Sometimes true.
Not always; can be regulatory blind spot.
Fair. The question we usually raise is whether any of your team handles client commitments, complaints or financial information by phone. If yes, can your current setup keep a recording for a year if a customer disputes a call?
GDPR and sector-specific rules in Luxembourg often expect retrievable records.
"What about CRM, can Fix4Bizz call from HubSpot?"
Real workflow concern.
Wants productivity, not just dial tone.
This is exactly where the gap is most visible. Tango's public Fix4Bizz page does not list CRM or API integrations. Mixvoip publishes its CRM integration list and a documented API. Would you like to see a demo with your CRM?
mixvoip.com integrations page versus tango.lu/en/business/tangofix4bizz.
"Number portability locks me in for years."
Past experience.
Switching cost.
In Luxembourg, fixed and mobile number portability is mandated and free under ILR rules. Tango does not own your number any more than we do. Would a written switching plan put that worry to bed?
ILR fixed-number portability regulation, in force since 2016.
"Tango has shops everywhere."
Retail comfort.
Wants to walk in if needed.
The shops are mostly for SIM cards, smartphones and consumer fibre. For a business phone system, the right comparison is the team behind your account. Who would you actually call about a queue misbehaving on a Tuesday morning?
tango.lu store finder, mainly consumer-facing locations.
"They are bigger than you, so they must be more reliable."
Heuristic for risk.
Wants uptime.
Proximus Luxembourg is large, no question. Reliability for your phone system is mainly about platform redundancy and the team running it. Both Tango Fix4Bizz and Mixvoip use redundant Luxembourg data centres. The difference shows up in feature reliability under load. Would a reference customer of similar size to yours help here?
Tango Fix4Bizz page states duplication across two sites; Mixvoip publishes its SLA terms.
"We have to consolidate vendors."
Procurement directive.
Genuine simplification.
Hear you. If consolidation is the goal, the question is whether a phone system with deeper features but a clean single contract gets you closer to the goal than a bundled product with a thin feature set. Where is most of your team's time going today?
Customer-by-customer; depends on consumed services.
"Will switching break our existing Yealink phones?"
Fear of stranded hardware.
Sunk-cost protection.
No. Yealink T42U, T46U, T48U and the DECT range are widely supported. We routinely reconfigure them onto our platform without buying new units. Would a list of compatible models help?
Yealink models supported by Tango Fix4Bizz; same family is supported by Mixvoip.

D. Win/loss pattern map

We win when…
  • The buyer needs IVR, queues, recording, CRM integration or Microsoft Teams calling, and discovers Fix4Bizz does not publish those features.
  • The buyer is a 10-to-100-person Luxembourg or Greater Region SME and feels like a small fish in the Tango sales process.
  • The buyer wants the phone system to be independent of which fibre operator they use, especially after a bad Tango fibre installation experience.
  • The buyer has cross-border employees in Belgium, France or Germany and wants one PBX that handles all of them with local numbers.
  • The buyer has been quoted by Tango first, used the price as an anchor, and is now sticker-shocked when add-ons (Pack Communication, Bizz2Go, modem, activation, hardware) appear in the small print.
We lose when…
  • The buyer is a solo entrepreneur or 2-to-4 person company that genuinely needs only a landline number with voicemail and forwarding, on Tango fibre, with one supplier and one bill.
  • The buyer is already mid-contract on Tango Business Pack with material early-exit fees and limited time to evaluate alternatives.
  • The buyer's decision-maker chooses on brand familiarity ("everyone knows Tango") and treats telephony as a commodity.
  • The buyer is a Proximus NXT enterprise account where telephony is buried inside a wider managed services contract.
  • The buyer needs nothing more than what is on the Fix4Bizz feature list and is genuinely price-led.
The deciding factor. Whether the buyer's actual workflow needs anything beyond the seven features published on the Fix4Bizz page; everything else follows from that.

E. Pricing intelligence (estimated)

Public. Tango publishes the Fix4Bizz headline price at €9.90 per workstation per month, excluding tax (verified on tango.lu/en/business/tangofix4bizz as of May 11, 2026). Tango publishes GO)) fibre Bizz speeds up to 2 Gbit/s for business and an activation fee of €49 for any internet plan. Tango publishes the Pack Communication Fixe Bizz as an add-on for inclusive calls to 38 destinations. Tango does not publish: hardware purchase prices for Yealink endpoints, Bizz2Go pricing, per-minute call rates by destination, SLA pricing, premium support pricing, or any per-user uplift for additional features beyond the seven listed.
Estimated total cost of ownership. All figures below are analyst estimates, not Tango list prices.
Item
Estimated range (per month, ex. VAT)
Basis
Confidence
Fix4Bizz seat
€9.90 per user
Tango public price
High
Pack Communication Fixe Bizz (entry tier)
€15 to €30 per line
Typical LU operator add-on pricing; not published
Medium
Bizz2Go mobile companion
€0 to €5 per user
Often bundled with Tango mobile Bizz; not published as a standalone line item
Low
GO)) fibre Bizz (M to L, business)
€60 to €100 per site
Public consumer price points (€50 promo, €70 to €100 list) extrapolated to business; business pricing not always publicly listed
Medium
Yealink endpoint (T46U class, amortised)
€5 to €10 per user
Hardware cost spread over 36 months; purchase versus rental not always specified
Medium
Mobile line if bundled in Business Pack
€25 to €45 per user
GO)) mobile Bizz S/M/L public range
Medium
One-off activation
€49 per site
Tango public price
High
Realistic per-user blended monthly cost
€35 to €70
Sum of the above for a typical 10-user office
Medium
The headline €9.90 is real, but it covers only the seat. For a representative 10-user office on Tango fibre with Yealink phones, inclusive calling and the Bizz2Go option, total cost per user typically lands inside the €35 to €70 band before mobile.

F. Trigger and signal list

Trigger
What it signals
Outreach motion
Owner
Tango announces a price-list update on tango.lu/en/business
Likely uplift; existing Tango customers may be open to a quote
Targeted LinkedIn and email to Tango Fix4Bizz customers in the SME segment
Marketing
Public job posting at Proximus Luxembourg for "Tango B2B" sales
Signals push into business segment; competition will intensify
Refresh battle card; brief inside sales
Sales enablement
Customer complaint on Trustpilot referencing Fix4Bizz, Bizz2Go or business support
Active dissatisfaction in target ICP
Polite outreach with a switching-help resource
Marketing
Tango fibre outage or notable incident reported in LU press
Reliability conversation opens for the next 30 days
Publish a calm, evidence-based comparison piece
Content
New ILR consultation on portability or numbering
Switching friction may briefly increase or decrease
Update the switching guide on pbx.lu
Content
Tango announces new partnerships (Microsoft, Vodafone, Cisco) relevant to telephony
Feature gap may be about to close
Refresh feature-by-feature table within 30 days
Product marketing
LU prospect mentions "we already have a Tango quote" in discovery
High-intent moment
Apply the discovery question bank in section B
Account executive
Buyer reports cross-border employee in BE, FR or DE
Tango Fix4Bizz constraint hits
Lead with multi-country Mixvoip story
Account executive

G. Refresh log

Date
Change
Source
Logged by
2026-05-11
Initial BI page created from full research pass
tango.lu, proximus.lu, ILR, Wikipedia, Trustpilot, Proximus NXT
Miro

Part 2: AI / RAG-friendly blocks

H. Q&A for retrieval

Company and ownership
Q: What company operates the Tango brand in Luxembourg?
A: Tango is a brand of Proximus Luxembourg SA, a company headquartered at 18 rue du Puits Romain, 8070 Bertrange, Luxembourg.
Q: Who owns Proximus Luxembourg?
A: Proximus Luxembourg is a wholly owned subsidiary of the Belgian Proximus Group, which is majority-owned by the Belgian State (around 53.5 percent as of late 2023).
Q: When was Tango founded?
A: Tango launched in Luxembourg in 1998 and was sold by Tele2 to Proximus in 2008. The merger of Tango and Telindus into Proximus Luxembourg SA was completed in January 2019.
Q: How many customers does Tango have?
A: Tango reports around 276,000 to 280,000 customers across mobile, fibre, TV and landline as of recent public communications.
Q: How does Tango relate to Telindus or Proximus NXT?
A: Tango, Proximus NXT (formerly Telindus) and Codit are three brands of Proximus Luxembourg. Tango serves consumers and businesses with fewer than 10 employees. Proximus NXT serves medium-sized and large companies and public administrations.
Product features
Q: What is Tango Fix4Bizz?
A: Tango Fix4Bizz is Tango's cloud-hosted telephone exchange for business customers, marketed at a starting price of €9.90 per workstation per month and aimed at the self-employed and small businesses in Luxembourg.
Q: What features does Tango Fix4Bizz include?
A: Tango lists seven features as included in every plan: voice reception, absence management, voicemail, phone directory, call pickup group, call forwarding and call cascade.
Q: Does Tango Fix4Bizz include call recording?
A: No evidence on the Tango Fix4Bizz public page lists call recording as of May 11, 2026.
Q: Does Tango Fix4Bizz integrate with Microsoft Teams?
A: No public evidence of native Microsoft Teams Phone integration (Direct Routing or Operator Connect) for Tango Fix4Bizz as of May 11, 2026.
Q: What hardware does Tango Fix4Bizz use?
A: Tango Fix4Bizz uses Yealink desk phones, including the T42U, T46U, T48U, a Yealink DECT range and a Yealink conference phone.
Pricing and contracts
Q: How much does Tango Fix4Bizz cost?
A: The published headline price is €9.90 per workstation per month, excluding tax. Inclusive calling, mobile companion, hardware and other items are sold as add-ons and not bundled into that price.
Q: Does Tango publish detailed pricing for Fix4Bizz add-ons?
A: Partially. Tango lists the existence of options such as the Pack Communication Fixe Bizz and the Bizz2Go mobile app, but per-minute call rates and many add-on prices are not on the main product page.
Q: What is the contract term for Tango fibre business plans?
A: GO)) fibre Bizz plans are sold with commitment periods; GO)) mobile Bizz SIM-only plans are commitment-free, while smartphone-bundled mobile plans run for 24 months.
Q: Are there activation fees with Tango?
A: Yes. An activation fee of €49 applies to any subscription that includes an internet connection. GO)) fibre Bizz M, L and XL plans include free cabling and installation; GO)) fibre Bizz S charges €85.47 for installation.
Q: Does Tango publish a service level agreement for Fix4Bizz?
A: No public SLA is published on the Fix4Bizz page as of May 11, 2026.
Switching, porting, lock-in
Q: Can I keep my Luxembourg number if I leave Tango?
A: Yes. Number portability is mandated and free under ILR rules in Luxembourg, for both fixed and mobile numbers.
Q: How long does it take to switch from Tango to another provider?
A: Fixed number portability in Luxembourg typically takes a few business days once the porting request is filed by the gaining operator. Timing depends on infrastructure access at the new address.
Q: Can I keep my Yealink phones if I switch from Tango?
A: Yes. Yealink desk phones supplied through Tango can usually be reconfigured by another Cloud PBX provider that supports Yealink, including Mixvoip.
Q: What happens to my Tango contract if I grow past 10 employees?
A: The Tango brand is scoped to residential and businesses with fewer than 10 employees. Larger companies are typically referred internally to Proximus NXT for an enterprise contract, which is a separate quote and account.
Q: Is there a typical exit penalty?
A: Tango applies commitment periods on bundled business plans; early termination outside specific exceptions (such as moving abroad with proof of residence) generally triggers a remaining-term fee.

I. Controlled vocabulary

Their term
Closest equivalent at Mixvoip / pbx.lu
Tango Fix4Bizz
Voxbi Cloud PBX
Telephone exchange
Cloud PBX
Workstation
User seat or extension
Bizz2Go
Mobile softphone / mobile convergence
GO)) fibre Bizz
Business fibre internet
GO)) mobile Bizz
Business mobile plan
Pack Communication Fixe Bizz
Inclusive calling pack
4G@Home Bizz
4G backup connectivity
Tango Business Pack
Bundled business connectivity
Call cascade
Call forwarding chain or hunt group
Absence management
Out-of-office or do-not-disturb
Voice reception
Auto-attendant (basic)
Convergence
Fixed-mobile convergence
Customer portal
Admin portal
MyTango
Self-service portal
Proximus NXT (formerly Telindus)
Enterprise sister product (out of Tango brand scope)

Part 3: Deep research

1. Executive summary

Tango is the consumer and small-business brand of Proximus Luxembourg, the local subsidiary of the Belgian Proximus Group. Founded in Luxembourg in 1998 and operating from Bertrange, Tango is the country's second mobile network operator and a wholesale and retail fixed-line operator, with around 280,000 customers across mobile, fibre, TV and landline. Its business unit sells fibre internet (GO)) fibre Bizz, up to 2 Gbit/s), mobile plans (GO)) mobile Bizz with 5G) and a cloud telephone exchange called Tango Fix4Bizz, alongside a one-bill bundle called Tango Business Pack.
Tango Fix4Bizz is a basic, single-tier Cloud PBX hosted in two redundant Tango data centres in Luxembourg, priced at €9.90 per workstation per month and explicitly aimed at the self-employed and small businesses. The published feature list is short: voice reception, absence management, voicemail, phone directory, call pickup group, call forwarding and call cascade. There is no public evidence of IVR, queues, call recording, real-time analytics, Microsoft Teams Phone integration, CRM connectors or open APIs on Fix4Bizz as of May 11, 2026. Mobile convergence is delivered via the Bizz2Go iOS and Android app, with Yealink T42U, T46U, T48U and DECT phones as standard hardware.
Crucially, the Tango brand is officially scoped to residential customers and small businesses with fewer than 10 employees. Medium-sized and larger Luxembourg organisations are handed off inside Proximus Luxembourg to a different brand, Proximus NXT (formerly Telindus), with a different sales motion, account management model and contract structure. This creates a clear positioning gap for vendor-neutral Luxembourg SME Cloud PBX players: prospects who outgrow Tango but do not want the heavy ICT-integrator pattern of Proximus NXT are an open market.
Trustpilot reviews (1.8 of 5 across 63 reviews, with 78 percent at 1 star) reflect a consumer-grade service experience rather than a dedicated business support model. None of this makes Tango Fix4Bizz a poor choice for its intended audience; it does mean buyers with even modest feature expectations or multi-country operations should compare carefully.
For Mixvoip, the bottom line is straightforward: Tango wins on entry price and one-bill bundling for very small offices on Tango fibre; Mixvoip wins on feature depth, SME service model, multi-country reach and access-agnostic deployment.

2. Company and market position

Tango is operated by Proximus Luxembourg SA, a Luxembourg-registered société anonyme (RCS B19669), headquartered at 18 rue du Puits Romain, 8070 Bertrange. Proximus Luxembourg was created in January 2019 by merging the local entities of Tango and Telindus and currently runs three brands: Tango (consumer and micro-business), Proximus NXT (enterprise ICT and telecom, formerly Telindus) and Codit (integration and AI). Reported headcount sits between 700 and 800 staff.
The Tango brand has been on the Luxembourg market since 1998 and is the country's second-largest mobile network operator, behind POST Luxembourg and ahead of Orange Luxembourg. As of recent public communications, Tango reports around 276,000 to 280,000 customers across mobile, fibre, TV and landline. Distribution is a mix of around 10 owned Tango stores and 16 to 20 partner outlets across Luxembourg. Tango has a long-standing roaming partnership with Vodafone.
Proximus Group (Euronext Brussels: PROX) is majority-owned by the Belgian State (53.51 percent at end-2023). It owns 4.56 percent of its own shares, with the remainder publicly traded. Proximus Luxembourg is consolidated within the group's international operations.
Market positioning is explicit: per the official Proximus Luxembourg brand page, "Tango offers fixed and mobile telephony, Internet and TV services to residential customers and small businesses with less than 10 employees." Larger Luxembourg organisations are handled by Proximus NXT, which has approximately 430-plus experts and offers managed services, datacentres, enterprise networks, security and convergent telecom. The two brands are integrated commercially but separated in scope and team structure.
Tango is ILR-notified as an electronic communications service provider in Luxembourg and participates in the country's mandatory number portability scheme.

3. Product portfolio

Category
Offering
Verified evidence
Notes / limitations
Cloud PBX
Tango Fix4Bizz
tango.lu/en/business/tangofix4bizz; cloud.tango.lu/en
Single tier at €9.90 per workstation per month; basic feature set
Mobile softphone
Tango Bizz2Go app (iOS, Android)
apps.apple.com/lu/app/tango-bizz2go; tango.lu Fix4Bizz page
Business and private modes; fixed-mobile convergence companion
Business mobile
GO)) mobile Bizz (S, M, L, Unlimited, Unlimited Extra)
tango.lu/en/business/mobile/plans/go-mobile-bizz
5G in Luxembourg; data in Europe and USA included on most plans; 24-month commitment with smartphone, no commitment SIM-only
Business mobile (LU-only)
Tango Smart Bizz LU
tango.lu/en/business/mobile/plans/tango-smart-bizz-lu
5G in Luxembourg only; roaming blocked by default
Business fibre
GO)) fibre Bizz (S, M, L, XL)
tango.lu/en/business/internet-landline/go-fibre-bizz
Up to 2 Gbit/s for business; landline included for incoming calls; outbound by the minute unless bundled
Inclusive calling
Pack Communication Fixe Bizz
tango.lu/en/business/options/internet/communication-pack-bizz
Adds inclusive calls to LU plus 38 destinations including US and Canada; no commitment
4G backup
4G@Home Bizz
tango.lu/en/business/internet-landline/go-fibre-bizz/a4athome
300 GB per month; up to 64 Wi-Fi devices; useful for installation gap and failover
Bundle
Tango Business Pack
tango.lu/fr/tango-business-pack
Combines GO)) fibre Bizz, GO)) Smart Bizz and Tango Fix4Bizz on one invoice
Hardware
Yealink T42U, T46U, T48U, DECT, conference phone
tango.lu/en/business/tangofix4bizz
Standard SIP endpoints; can be reconfigured to other Cloud PBX providers if customer leaves
Customer self-service
MyTango app and customer area
tango.lu, App Store, Play Store
Mass-market self-service; not a business-grade admin portal
Not in scope under the Tango brand: enterprise-grade Cloud PBX with advanced features (handled by Proximus NXT under a different product family), SIP trunking for third-party PBX (Proximus NXT scope), data centre colocation, managed networks and managed security.

4. Feature-by-feature assessment

Capability
Available on Tango Fix4Bizz
Evidence
Analyst note
Cloud PBX (hosted exchange)
Yes
tango.lu Fix4Bizz page
Single tier, hosted in two Tango data centres in Luxembourg
SIP trunking to third-party PBX
Unclear
No public Tango Fix4Bizz mention
Likely handled at Proximus NXT level for enterprise customers
Mobile app (softphone)
Yes
Bizz2Go iOS/Android
Business and private modes; works with mobile network when off-LAN
Desktop softphone
Unclear
Not on public Fix4Bizz page
No evidence of a Windows or macOS softphone client
Browser softphone (WebRTC)
Unclear
Not on public Fix4Bizz page
No public mention
Desk phones
Yes
Yealink T42U, T46U, T48U
Mainstream Yealink range
DECT cordless
Yes
Yealink DECT antenna and handsets
Up to 5 devices per antenna
Conference phone
Yes
Yealink conference phone
Standard hardware
Microsoft Teams Phone integration
No (no public evidence)
Tango Fix4Bizz page; Microsoft Learn certified provider list
Tango brand is not on Microsoft's certified Direct Routing or Operator Connect lists as of May 11, 2026
IVR / auto-attendant menus
Partial ("voice reception")
Tango Fix4Bizz feature list
Basic; no published multi-level IVR or time-of-day routing detail
Call queues
No (no public evidence)
Tango Fix4Bizz feature list
Not listed
Call recording
No (no public evidence)
Tango Fix4Bizz feature list
Not listed
Real-time and historical analytics
No (no public evidence)
Tango Fix4Bizz feature list
Not listed
Voicemail
Yes
Listed
Standard mailbox per user
Business continuity / failover
Partial
Redundant data centres; Bizz2Go uses Tango mobile network if internet fails
No published RTO/RPO targets
CRM integration
No (no public evidence)
Tango Fix4Bizz page
No published CRM connectors or integrations
Open API
No (no public evidence)
Tango Fix4Bizz page
No published API for developers or partners
Admin portal
Yes
"Configuration via a web portal"
Basic; depth not publicly documented
Multi-site
Yes
"Connect a new site to your main site"
Mentioned as supported
International numbers
Unclear / limited
LU-centric product page
Tango Fix4Bizz is described as a Luxembourg telephone exchange; cross-border numbering not foregrounded
Remote work
Yes (LU only)
"Telephone stations at employees' homes (valid only in Luxembourg)"
Explicit Luxembourg-only scope for remote stations
Bundle dependency
Yes (preferred)
Sold with GO)) fibre Bizz
Best operational experience when combined; standalone is technically possible but not the promoted path
Number portability
Yes
ILR regulation
Mandatory in Luxembourg for any operator
24/7 support
Claimed
tango.lu business page
"24/7 technical support" advertised; depth and business-specific SLA not separately published
Service-level agreement (SLA)
No (no public evidence)
tango.lu
No SLA published on the Fix4Bizz page
Hosting model
Vendor-hosted in LU
Two redundant data centres
Hosted only by Tango; no self-host or partner-host option
ISO 27001 / certifications
Unclear
Not on Tango Fix4Bizz page
Proximus Group reports group-level certifications, but no Tango-specific Fix4Bizz claim

5. Service model assessment

Onboarding and migration. Tango Fix4Bizz is described as ready-to-use with a simple installation and a web admin portal. For new customers, onboarding usually pairs with a GO)) fibre Bizz install, which Tango operates with technician-led appointments and a 4G@Home stop-gap during the typical 1 to 4-week fibre install window. Number porting from another LU operator is supported via the ILR portability process.
Support. Tango advertises 24/7 technical support and a Business customer service. Channels include phone (27777377 for the Business team), email, web form and walk-in stores. The published Trustpilot rating is 1.8 of 5 across 63 reviews (May 11, 2026), with recurring themes of long support hold times, store handling inconsistencies, billing disputes and slow incident resolution. These complaints are mostly from consumer customers, but business customers share the same operator and many of the same channels. Tango does not publish a separate business SLA on the Fix4Bizz page.
Languages. Customer service operates in French, English, German, Luxembourgish and Portuguese, reflecting the broad linguistic mix in Luxembourg. The public website is published in English, French, German and Luxembourgish.
Local presence. Around 10 owned Tango stores and 16 to 20 partner outlets across Luxembourg, plus headquarters in Bertrange. The retail network is consumer-skewed; complex business issues are handled by the Business team remotely.
Managed versus self-service. Fix4Bizz is configured by the customer through a web portal. Tango engineers maintain the platform itself. For deeper integrations or managed services (CRM, contact centre, managed LAN, security), buyers are referred to Proximus NXT.
Hardware. Yealink desk phones, DECT and conference units are supplied by Tango. Purchase versus lease terms are not consistently published on the Fix4Bizz page.
Portability. Fixed and mobile number portability is mandated free under ILR rules. Yealink hardware can be reconfigured by another Cloud PBX provider that supports the model.
Enterprise readiness. Limited under the Tango brand. Enterprises that need ISO-certified hosting, managed contact centre features, custom integrations or large multi-site deployments are typically routed to Proximus NXT.
SME friendliness. Strong for the 1 to 10-person band that matches the brand scope. Weaker for SMEs of 15 to 200 users that want richer features without the enterprise procurement model.

6. Pricing assessment

6.1 Public pricing summary

  • Tango Fix4Bizz: €9.90 per workstation per month, ex. tax. Published.
  • GO)) fibre Bizz: published in promotional ranges (consumer rates currently around €50 to €100 per month). Specific business tier pricing is sometimes only fully visible to logged-in or quoted prospects.
  • GO)) mobile Bizz: published tiered prices for S, M, L, Unlimited and Unlimited Extra+; smartphone subscriptions involve a 24-month commitment.
  • Pack Communication Fixe Bizz: existence published; per-tier pricing not on the main option page.
  • Activation fee: €49 for any internet plan. Published.
  • Tango Fibre Bizz S installation: €85.47 (M, L, XL: free). Published.
  • Yealink hardware: model list published; per-unit prices not on the Fix4Bizz page.
  • Bizz2Go: existence and feature list published; standalone pricing not on the Fix4Bizz page.
  • Per-minute outbound call rates outside the Pack: existence noted; the rate card itself is published under separate documents and not on the Fix4Bizz page.

6.2 Transparency score: 2 of 5

The Fix4Bizz headline price is clearly displayed and easy to find. Beyond that, the buyer must combine several pages (and often a quote) to understand total cost. Add-on prices, per-minute rates, Bizz2Go pricing, hardware costs and SLA pricing are not on a single, consolidated business pricing page. Tango is more transparent than some Luxembourg competitors and less transparent than vendor-neutral providers who publish fully itemised business price books.

6.3 Likely hidden-cost risks

  • Per-minute outbound calls outside the Pack Communication Fixe Bizz, particularly to mobile and international destinations.
  • Modem rental, typically €5 to €7 per month on consumer fibre tiers, and possibly on business tiers.
  • One-off installation cost for the Fibre S tier (€85.47) and for "complex" installations (around 10 percent of cases).
  • Yealink hardware: purchase versus monthly amortisation is not consistently published.
  • Bizz2Go: bundled in some Business Packs, possibly a paid option in others.
  • Early-exit fees on bundled Business Pack contracts.
  • Re-pricing risk at the end of promotional periods (a recurring theme in residential Trustpilot complaints; less documented for businesses but the same operator).

6.4 Buyer questions to ask before signing

  1. What is the all-in monthly cost per user, including Fix4Bizz seat, Pack Communication, Bizz2Go, modem, hardware amortisation and mobile?
  1. What is the rate card for per-minute calls outside the Pack, especially to LU mobile and to the EU?
  1. Is there a separate SLA document for Fix4Bizz, with uptime targets, response times and service credits?
  1. Is hardware purchased or rented, and what happens to it at end of contract?
  1. What is the contract term, the renewal mechanism and the exit penalty if the company grows past 10 employees or relocates?
  1. Which features in our requirement list (recording, IVR, queues, Teams, CRM integration, API) are not included and not on the roadmap?
  1. If we need any of the items in question 6, will we be re-quoted by Proximus NXT, and what will that look like commercially?
  1. What is the support model: shared queue, dedicated business team or a named contact?
  1. What is the migration plan to port numbers, reconfigure Yealink phones, and shift e-mail-to-fax or alarm lines?
  1. What is the price escalation clause after the first commitment year?
  1. Is Microsoft Teams calling supported, and if so via which mechanism (Direct Routing, Operator Connect, third-party)?
  1. Are there any certifications (ISO 27001, PCI DSS) that apply specifically to Fix4Bizz rather than the parent group?

7. Ideal customer profile

Best fit (where Tango Fix4Bizz is genuinely a sensible choice)
  • Self-employed professional or microbusiness (1 to 5 users) in Luxembourg.
  • Already a Tango fibre or mobile customer, valuing one-bill simplicity.
  • Phone usage is mostly incoming, with light outbound.
  • Needs only voicemail, forwarding, basic auto-attendant.
  • No CRM integration, no Teams calling, no call recording requirement.
  • No remote workers outside Luxembourg.
Poor fit
  • SMEs of 10 to 200 users in Luxembourg or the Greater Region.
  • Companies with employees in Belgium, France or Germany who need local numbers and a single PBX.
  • Companies operating call queues, contact centres or any team that handles call-heavy workflows.
  • Companies handling regulated calls that may need recording (financial advice, healthcare advice, customer support with SLAs).
  • Companies already standardised on Microsoft Teams and wanting Teams Phone with a Luxembourg number.
  • Companies requiring an open API for custom integrations.
Watch-outs
  • A microbusiness today may grow past 10 employees within the contract term, at which point the Tango brand scope no longer applies; the next conversation is with Proximus NXT, with materially different commercial terms.
  • A buyer attracted by the €9.90 seat may underestimate the price impact of add-ons.
  • A buyer who depends on consumer-grade support channels may underestimate business-impact incidents on those channels.

8. Strengths and weaknesses versus Mixvoip

Clear strengths

  • Low headline price per seat (€9.90 per workstation per month).
  • Owned mobile network (5G), allowing tight fixed-mobile bundling and Bizz2Go convergence over Tango mobile data.
  • One-bill convenience across fibre, mobile and Cloud PBX through Tango Business Pack.
  • Established consumer brand with 25-plus years of LU market presence and high recognition.
  • Backed by Proximus Group, a financially strong and politically backed European operator.
  • Two redundant Luxembourg data centres for Fix4Bizz hosting.
  • Multilingual customer service consistent with the LU market.

Clear weaknesses

  • Feature depth: the published Fix4Bizz feature list contains only seven basic items. No public evidence of IVR menus beyond a basic "voice reception", call queues, call recording, analytics, CRM connectors, API or Microsoft Teams Phone integration as of May 11, 2026.
  • Scope cap: Tango brand is officially limited to businesses with fewer than 10 employees. SMEs in the 10 to 200 range are not the design audience.
  • Multi-country: Fix4Bizz remote-station capability is explicitly Luxembourg-only. Customers with employees in Belgium, France or Germany are not a fit.
  • Access bundling: best operational experience requires Tango fibre as the access leg, which limits choice if the customer prefers a different ISP.
  • Business support model: consumer-grade public reviews (Trustpilot 1.8 of 5 across 63 reviews) suggest a shared support model rather than a dedicated business team with named contacts.
  • No published SLA on the Fix4Bizz product page.
  • No published list of business reference customers in the Fix4Bizz feature pages.

Neutral / depends-on-context points

  • Hardware: Yealink T42U/T46U/T48U/DECT is mainstream and supported by most competing platforms, including Mixvoip. Hardware is rarely a deciding factor either way.
  • Mobile convergence: Bizz2Go works if the customer also uses Tango mobile; for customers on other mobile networks, the advantage shrinks.
  • Trustpilot ratings: low ratings reflect the broader Luxembourg ISP pattern (POST and Orange Luxembourg show similarly low scores), so they should be read as sector-wide noise rather than uniquely a Tango issue.
  • Number portability: free and mandated for both providers; not a differentiator.
  • Hosting in Luxembourg: a strength shared with Mixvoip, so it is a category baseline rather than a Tango advantage.

9. SEO gap analysis

Gap
Evidence / observation
Search intent
Keyword cluster
Recommended pbx.lu page
Mixvoip advantage
No detailed Fix4Bizz feature documentation
Tango lists seven features and stops
Buyers researching specific features
"tango fix4bizz features", "tango fix4bizz reviews", "tango fix4bizz alternatives"
A vendor-neutral comparison page: /competitors/tango
Mixvoip can show a side-by-side feature checklist
No public Fix4Bizz pricing breakdown beyond €9.90
Add-on prices buried
Cost-curious buyers
"tango fix4bizz price", "tango cloud pbx cost", "tango fixed line business price"
A "Total cost of ownership" angle on /competitors/tango
Mixvoip publishes itemised business pricing
No content about Fix4Bizz vs Microsoft Teams
Not addressed by Tango
Teams-first buyers
"microsoft teams calling luxembourg", "teams phone luxembourg"
/features/microsoft-teams-integration
Mixvoip integrates with Teams Phone
No content about Fix4Bizz call recording
Not addressed
Regulated and compliance buyers
"call recording luxembourg", "gdpr call recording"
/features/call-recording
Mixvoip publishes its recording capability
No content about IVR design with Fix4Bizz
Not addressed
Buyers wanting menu-driven call flow
"ivr luxembourg", "auto attendant luxembourg"
/features/ivr
Mixvoip ships multi-level IVR
No content about call queues with Fix4Bizz
Not addressed
Buyers with call-heavy teams
"call queue luxembourg", "phone queue luxembourg"
/features/call-queues
Mixvoip ships call queues
No CRM-integration content for Fix4Bizz
Not addressed
Sales and support teams
"phone system crm luxembourg", "hubspot phone luxembourg", "salesforce phone luxembourg"
/features/integrations
Mixvoip publishes a CRM integration list
No API content for Fix4Bizz
Not addressed
Developers, integrators
"voip api luxembourg", "pbx api luxembourg"
/features/api
Mixvoip publishes an API
No SLA documentation for Fix4Bizz
Not addressed
Compliance and procurement
"tango sla", "cloud pbx sla luxembourg"
/faq sla section
Mixvoip publishes SLA terms
No multi-country / cross-border story
Fix4Bizz home stations are LU-only
Buyers with BE/FR/DE staff
"cloud pbx greater region", "cloud pbx benelux", "cross-border phone system luxembourg"
/use-cases/cross-border-companies
Mixvoip operates beyond LU
No migration content (how to leave Tango)
Tango does not publish a switching guide
Customers considering a move
"switch tango cloud pbx", "leave tango business", "port luxembourg number"
A migration sub-page under /competitors/tango
Mixvoip can publish a step-by-step switching guide
No content about Yealink reuse
Not addressed by Tango
Cost-sensitive switchers
"reuse yealink t46u", "keep yealink phones switching provider"
A short FAQ on /competitors/tango
Mixvoip supports reconfiguring existing Yealink fleets

10. GEO gap analysis

Gap
Local / geographic context
Why competitor under-serves it
Recommended pbx.lu page angle
Mixvoip positioning angle
Greater Region cross-border SMEs
Many LU companies employ commuters from BE, FR, DE
Tango Fix4Bizz home stations are LU-only by design
/use-cases/cross-border-companies
One PBX, local numbers in LU, BE, FR, DE
Companies with offices in BE and FR
Belgian and French branches of LU groups
Tango brand scope is LU and brand recognition outside LU is weaker
/competitors/proximus-belgium-vs-mixvoip (group-level comparison)
Mixvoip's footprint across LU, BE, FR, DE
Cross-border porting of mobile numbers
Common need for staff working between countries
Tango focuses on LU portability
/glossary/number-portability sub-section
Mixvoip handles multi-country numbering
German-language SME support
German-speaking SMEs and DE border companies
Tango supports German but is LU-centric
/use-cases/german-speaking-smes
Mixvoip provides DE-language support and DE numbering
Luxembourg financial sector (CSSF-supervised)
PSF status, recording, archival, audit needs
Tango Fix4Bizz does not publish recording or audit features
/use-cases/financial-services-luxembourg
Mixvoip publishes recording and retention controls
Luxembourg public-sector RFPs
ILR-driven procurement, security requirements
Tango brand is consumer; public-sector demand goes to Proximus NXT, not Tango
/use-cases/public-sector-luxembourg
Mixvoip can position as an SME-grade vendor-neutral alternative inside RFPs
Border-zone hospitality (LU/DE/BE/FR campings, hotels)
Multi-country numbering, multilingual IVR
Tango product is LU-only with no multilingual IVR story
/use-cases/hospitality
Mixvoip can offer multi-country, multilingual setups
Logistics and transport with mobile teams across borders
Drivers, dispatchers, multi-country pickups
Bizz2Go is tied to Tango mobile and Luxembourg landline numbers
/use-cases/transport-and-logistics
Mixvoip works with any mobile carrier across LU/BE/FR/DE
Construction and field service companies with cross-border crews
Local LU companies with sites across the border
LU-only constraint on home stations is a hard stop
/use-cases/construction
Mixvoip supports mobile and on-site users regardless of country
Tax and accounting firms serving cross-border clients
Multilingual reception, language-routed IVR
No published multilingual IVR on Fix4Bizz
/use-cases/professional-services
Mixvoip handles language-routed IVR

11. Content opportunities for pbx.lu

Article ideas (informational, top of funnel)
  1. "Tango Fix4Bizz explained for non-technical buyers in Luxembourg."
  1. "What the €9.90 Fix4Bizz price actually covers, and what it does not."
  1. "Tango Fix4Bizz seven features in plain English, and what each one really does."
  1. "How fixed number portability works in Luxembourg if you want to leave Tango."
  1. "What happens when your small business outgrows 10 employees on Tango."
  1. "Tango versus Proximus NXT: when does Tango stop and Telindus start."
  1. "How to keep your Yealink T42U / T46U / T48U phones when switching providers in Luxembourg."
  1. "What Microsoft Teams calling looks like in Luxembourg, and where Tango Fix4Bizz fits or does not."
  1. "Cloud PBX for cross-border teams: why Luxembourg-only matters."
  1. "Reading a Tango business quote: ten line items to check before signing."
Comparison page ideas (middle of funnel)
  1. Tango Fix4Bizz vs Voxbi Cloud PBX.
  1. Tango Fix4Bizz vs POST Luxembourg Cloud PBX.
  1. Tango Fix4Bizz vs Orange Luxembourg business voice.
  1. Tango Fix4Bizz vs 3CX hosted by a Luxembourg partner.
  1. Tango Fix4Bizz vs Wildix.
  1. Tango Fix4Bizz vs Microsoft Teams Phone with Direct Routing.
  1. Tango Fix4Bizz vs an on-premise Innovaphone deployment.
  1. Tango Fix4Bizz vs Eltrona Cloud PBX.
  1. Tango Fix4Bizz vs Visual Online Cloud PBX.
  1. Tango Fix4Bizz vs Luxnetwork managed voice.
FAQ ideas (long-tail, retrieval-friendly)
  1. Can I keep my Tango landline number if I switch?
  1. Does Tango Fix4Bizz record calls?
  1. Does Tango Fix4Bizz work with Microsoft Teams?
  1. Can Tango Fix4Bizz give my employee in Belgium a Luxembourg number?
  1. How long does it take to port a fixed number from Tango?
  1. What is the total monthly cost of Tango Fix4Bizz for ten users?
  1. Does Tango Fix4Bizz have an API?
  1. Are my Tango-supplied Yealink phones unlockable for another provider?
  1. What contract length does Tango require for Fix4Bizz?
  1. What happens to my Tango Business Pack if I move abroad?
Commercial BOFU page ideas
  1. "Switch from Tango Fix4Bizz to Voxbi Cloud PBX, step by step."
  1. "Tango buyout: Mixvoip's commercial offer for businesses still under Tango contract."
  1. "Luxembourg SMEs of 10 to 200 users: a vendor-neutral feature checklist."
  1. "Free migration plan for businesses leaving Tango Fix4Bizz."
  1. "Mixvoip vs Tango Fix4Bizz: book a 20-minute, no-obligation comparison call."

12. Objections and switching triggers

Reasons buyers stay with Tango
  • One supplier, one bill across fibre, mobile and Cloud PBX.
  • Existing Tango fibre and mobile contracts not yet expired.
  • Genuine satisfaction with a very simple landline use case.
  • Brand recognition and a national operator's perceived stability.
  • No internal trigger to re-evaluate the phone system.
Reasons buyers leave Tango
  • Feature gap discovered late: no recording, no real IVR, no queues, no Teams integration, no CRM hooks, no API.
  • Scope gap: company grew past 10 employees and now sits awkwardly inside the Tango brand.
  • Multi-country growth: new staff in Belgium, France or Germany cannot be served by Fix4Bizz home stations.
  • Support friction: long resolution times on critical issues.
  • Total cost surprise: actual monthly bill is materially above the €9.90 headline once add-ons accumulate.
  • Unhappy fibre installation or repair experience that leaks into business-line sentiment.
Likely switching triggers toward Mixvoip
  • Office move, new fibre install or fibre renewal date.
  • New CRM rollout (HubSpot, Salesforce, Pipedrive, Odoo, Dynamics).
  • Microsoft Teams adoption with a request for proper Teams calling.
  • New hire in BE, FR or DE that needs to be reachable on the company number.
  • Compliance or insurance requirement to record certain calls.
  • Buyer-side procurement review of all telecom contracts.
Proof pbx.lu needs to persuade them
  • A clean, scannable feature comparison page.
  • An itemised price comparison for a realistic 10-user office.
  • A switching guide with portability timeline.
  • Yealink hardware compatibility list.
  • Customer references at similar size, ideally with cross-border mention.
  • A Greater Region map showing local numbers in LU, BE, FR, DE.

13. Evidence gaps and unknowns

  • Exact Tango Fix4Bizz price for tiers above the basic seat, if any.
  • Whether Tango sells Fix4Bizz as a standalone product or only paired with GO)) fibre Bizz.
  • Per-minute call rate card for outbound calls outside the Pack Communication Fixe.
  • Whether Tango offers any SIP trunking product to third-party PBXs under the Tango brand (separate from Proximus NXT).
  • Whether Tango's data centres are Tier 3 or Tier 4 (Proximus NXT publishes data centre figures, but specific Fix4Bizz hosting tier is not on the Tango page).
  • Any ISO 27001 certification statement specifically for Fix4Bizz.
  • Tango Fix4Bizz published SLA, including uptime targets, response times and service credits.
  • Tango's actual conversion path when a sub-10 employee Fix4Bizz customer crosses the headcount threshold: forced migration, grace period, contract continuity.
  • Bizz2Go standalone pricing outside the Tango mobile bundle.
  • Yealink purchase versus rental prices.
  • Number of Tango Fix4Bizz business customers (not aggregated into the 280,000 total).
  • Tango's roadmap for Microsoft Teams integration, AI features or analytics.
These are the research targets for the next refresh.

14. Sources

Primary, official sources
Press and third-party

Bottom line

A Luxembourg business should seriously consider Tango when it is genuinely a 1 to 10-person Luxembourg-only operation that wants the cheapest possible landline replacement bundled with Tango fibre and mobile on a single invoice, and should look at Mixvoip when it is a 10 to 200-person SME (anywhere in the Greater Region) that needs real IVR, queues, call recording, CRM or Microsoft Teams integration, and a phone system that is independent of which fibre operator powers the office.