Belgium Mobile Important Information

Author David Janssens

Last updated: 17.09.2025 by Linda Heiskanen

Device support

The device support list below shows the compatibility of devices in combination with Telavox Mobile, and does not reflect or list up the features of devices. All Models/operating systems which are not mentioned in this list, do not support Telavox Mobile at the moment.

This is a constantly evolving list and will be updated consequently. If you have any doubts or questions about a specific device, please reach out to our sales or support team.

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Note

Please make sure that the device itself actually supports the technical feature. (VoLTE, 5G, VoWiFi, etc.)

For example: If a brand in combination with Telavox Mobile supports VoLTE or 5G, this does not mean that this device has VoLTE or 5G as a technical feature available.

A tip for devices supporting multi-SIM cards: 

On some devices, SIM1 is technically “better” (supports higher-end connectivity), while SIM2 may be restricted, so we advise you to use SIM1/Primary when testing or installing Telavox Mobile.

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A2P SMS

What is A2P?

A2P SMS are Application to Person SMS messages. Various businesses/services send SMS to their customers (e.g. 2FA, forgot password, mobile number validation, etc). These SMS messages are usually sent from shortcode numbers (8801, 8820, 7200 and so on). There is a complex landscape of SMS aggregators between the business/service and Telavox and although A2P largely works, there are still some services that still need to be routed correctly.

A2P Status 

Since we are a new mobile operator, these applications or SMS aggregators often have to make adjustments on their end to correctly deliver these to us. It is very difficult to determine which application reaches us through which route, but we are in contact with various SMS aggregators to resolve this.

This is a continuous ongoing improvement process that every new mobile operator has to go through until all SMS aggregators have been set-up correctly. The majority of the services are already functional however we are working hard to get the remaining ones up and running.

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Limitations

Microsoft Teams Direct Routing

At this moment, Telavox Mobile Licenses cannot be used in combination with Microsoft Teams Direct Routing.

Caller ID outgoing calls while roaming

While abroad, non-VoLTE calls will be anonymised while roaming.

Payment services

Payments via Mobile subscription are not supported (e.g. Netflix, Google, etc.)
Payments via Premium SMS are not supported (e.g. Parking, De Lijn)

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Mobile network information

Why is VoLTE important?

VoLTE means that your calls are using the 4G network (and not 2G or 3G). Due to the 3G network that has been shutdown by operators in Belgium and the low voice quality that you get from 2G network, VoLTE is the most important requirement.

Difference between calls over 4G/3G/2G:

  • Better sound quality during calls:
    • 4G: HD voice, much richer, closer to face-to-face conversation
    • 3G: clear and more natural
    • 2G: narrow, robotic, basic comprehensibility

  • Faster call setup : From the moment you press “call” until the callee phone rings:
    • 4G (VoLTE)  : +- 1 to 2 seconds
    • 3G (UMTS)  : +- 3 to 4 seconds
    • 2G (GSM)    : +- 5 to 7 seconds

  • Only with VoLTE you can call and use mobile data at the same time.

Make sure to check the Device Support list for our VoLTE support.

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Troubleshooting

In the meantime, if you still encounter services that are not working as intended, please open a ticket with our Technical Support with the following details:
 

  • Telavox Customer ID
  • Mobile Number
  • Description of the issue
  • Smartphone details (Brand, model & OS version)
  • Date & Time
    • Precise location/address when encountering the issue
    • Are you using a dual SIM setup? Is Telavox SIM primary?
    • Is the issue present indoors & outdoors?
    • Are all calls affected or just some?
    • Are only incoming or outgoing calls affected or both?
    • Is there also a problem with VoWifi? 
    • Was the user moving in the car/train/etc.?
    • Was the user using a Bluetooth device?
    • Was data also affected?

Extra For A2P SMS: 

  • Name of the business/service
  • Optional: Short code number (check your old SMS from this service if you still have them)
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