📞 Post Telecom: the national operator, with business telephony now under DEEP
Post Telecom is Luxembourg's national incumbent operator, owned by the government and operating the country's primary fixed and mobile networks. Since 2024, all business telephony, Cloud PBX, and ICT services moved to DEEP, Post's dedicated B2B brand. Post.lu now covers residential and basic consumer services.
⏱ 5 min read · 🇱🇺 Local provider · 📅 Updated April 2026 · 🔗 post.lu
🏢 Who Post Telecom is
Post Telecom, formally Entreprise des Postes et Télécommunications (POST Luxembourg), is the state-owned national operator. It operates Luxembourg's primary fixed and mobile network infrastructure, which other licensed operators in the country rely on.
For businesses, the key distinction to understand is the brand split introduced in 2024. Post divided its operations into two separate brands: post.lu for residential and basic consumer services, and DEEP for all business telephony, Cloud PBX, unified communications, and enterprise IT.
If you are looking for a Cloud PBX solution from Post, you are looking at DEEP Telecom, not post.lu.
📦 What Post offers
Post's current offer is split cleanly across two brands with different customer segments.
🏠 Residential and postal services (post.lu)
Broadband, consumer mobile, basic landlines, and postal services for individuals and very small businesses. This is the public-facing Post brand today.
🏢 Business telephony and ICT (DEEP brand)
Cloud PBX, Managed UC, Teams integration, data centres, and enterprise connectivity. All business telephony from Post is now sold through DEEP. See the DEEP Telecom profile for product details.
📡 Luxembourg network backbone
Post operates the national fixed and mobile infrastructure. Several other licensed operators rely on this network to reach their own customers, so Post's infrastructure underpins a significant share of Luxembourg telephony whether or not your provider is Post directly.
🔄 ISDN phase-out path
Legacy ISDN and analogue lines are being retired. Existing Post basic-line customers will need to migrate to an All-IP solution. DEEP offers this transition within the Post group; independent providers also offer it with different commercial terms.
⚖️ Quick compare with two local rivals
Post Telecom is Luxembourg's incumbent operator. This page compares it against two other local operators, so you can see how Post fits alongside alternatives.
ILR-regulated: ✅
Public pricing: ❌ quote only (business)
ISP independence: ⚠️ often bundled
Greater Region numbers: ❌ LU only
SIP trunks: ✅ via DEEP brand
Support languages: 4
📡 Mixvoip
Local operator
ILR-regulated: ✅
Public pricing: ✅
ISP independence: ✅ any ISP
Greater Region numbers: LU, BE, DE, FR
SIP trunks: ✅
Support languages: 4
🏢 DEEP Telecom
Post Group B2B brand
🔗 deep.eu
ILR-regulated: ✅ via POST
Public pricing: ❌ quote only
ISP independence: ⚠️ partial, often bundled
Greater Region numbers: ⚠️ LU-focused
SIP trunks: ✅
Support languages: 4
Comparison reflects public information. Sources linked from each provider page. Not a ranking.
👥 Typical client profiles
Based on how Post positions post.lu and DEEP across customer segments.
🏠 Residential and individual users
Households and individuals using post.lu for broadband, mobile, landline, and postal services. This is the core of the post.lu customer base.
🏪 Very small businesses on basic lines
Sole traders and micro-businesses still on post.lu basic phone lines. These customers are typically in the ISDN phase-out migration conversation.
🏛️ Enterprises and public sector (served by DEEP)
Medium and large organisations needing Cloud PBX, managed UC, or data centre services. These customers are served under the DEEP brand, not post.lu.
🔄 Legacy Post business customers in transition
Businesses that had Post Telecom contracts before 2024. Services are being migrated either to DEEP, to All-IP equivalents, or to third-party providers, depending on the customer's preference and contract.
🎯 Where Post stands apart
Three positioning points relevant for businesses evaluating Post.
🏛️ Luxembourg's national operator
State-owned, ILR-regulated, operating the country's primary fixed and mobile networks. For customers who prioritise national-operator stability and public-sector alignment, Post is the natural default.
🔗 Network backbone used by others
Several other licensed operators rely on Post's infrastructure to reach their customers. Even if your provider is not Post directly, your calls likely transit Post's network at some point.
⚠️ Business telephony lives under DEEP
For Cloud PBX, SIP trunks, and unified communications, post.lu is no longer the correct destination. All business telephony is now sold under the DEEP brand. Searching "Post Cloud PBX" should lead you to DEEP, not post.lu.
📚 Terms you can look up
Not sure what something on this page means? The pbx.lu glossary explains each in plain language.
🧩 Decision tree
Two honest recommendations based on business profile.
✅ Stay with Post if
- You are a residential or individual customer
- You are a very small business on basic post.lu lines with no Cloud PBX need yet
- You prefer to deal with the national operator for simplicity
- You want post.lu for mobile and are fine with telephony separately
- Your ISDN migration can be handled by DEEP under the same group
🟡 Look elsewhere if
- You are a business looking for Cloud PBX (you want DEEP, not post.lu, or an independent provider)
- You need transparent pricing before a sales conversation
- You want ISP independence with any internet connection
- You need local numbers in Belgium, Germany, or France
- You want a simpler deployment without enterprise contracting overhead
🔎 Other providers worth considering
If Post is not quite the right fit, these are the logical next pages to check.
Same category · other Luxembourg operators
Different category · vendors and platforms
❓ Common questions
I use Post for my business phone. Do I need to contact DEEP?
It depends on your service. If you have basic fixed lines from post.lu, you can keep those and add a Cloud PBX from an independent provider. If you want Post's own hosted PBX or managed communications service, you need to contact DEEP directly, as Post does not sell those products under the post.lu brand.
Can I keep my Post phone number if I switch providers?
Yes. Number portability is regulated in Luxembourg by the ILR. You can move your existing Post number to another provider without interruption to your service.
What is the difference between Post and DEEP?
Post and DEEP are two commercial brands of the same legal entity, POST Luxembourg. Post covers consumer and residential services. DEEP covers all business telephony, IT, and enterprise services. The split was formalised in 2024.
Is Post regulated by the ILR?
Yes. POST Luxembourg holds an operator licence regulated by the ILR (Institut Luxembourgeois de Régulation), the same body that regulates all licensed telecom operators in Luxembourg.
What does the ISDN phase-out mean for Post customers?
Luxembourg is migrating from legacy ISDN and analogue telephone lines to All-IP infrastructure. Existing Post basic-line customers will need to move to an IP-based solution. DEEP offers this transition within the Post group, but independent providers also offer a simpler, more cost-transparent path.
Can I use a non-Post provider and still benefit from Post's network?
Yes. Post operates Luxembourg's primary mobile network, which several other licensed operators use to reach their own customers. You can choose a Cloud PBX from a non-Post provider and still benefit from Post's mobile network through that provider's mobile offering.
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