Switch Mobile Operator Without Losing Your Number: Belgium Guide

Your bill went up, you found a better deal elsewhere — DIGI at €5/month or Mobile Vikings with no commitment — and your only real concern is losing your number. Good news: it is a legal right in Belgium since 2002, the process is free, and the transfer takes 1 business day with a maximum 30-minute interruption.

Can You Actually Keep Your Number When Switching Mobile Operators in Belgium?

Yes, it is a legal right since 2002. Mobile number portability is free and guaranteed by the IBPT (Belgian Institute for Postal Services and Telecommunications). Regardless of how long you have had the number or which operator you are leaving, you can keep it.

Number portability is the process that allows you to transfer your current mobile number to a new operator without a prolonged interruption. Your new operator contacts the old one to trigger the transfer on the date you chose when signing up.

In practice, at the agreed date and time, your old SIM loses its network signal. You insert the new one, and your number is active with the new operator. The actual interruption is 30 minutes at most (CallMePower, 09/03/2026).

Easy Switch or Direct Portability: What Is the Difference for Mobile?

Easy Switch does not apply if you are only changing your mobile subscription. This is the most common misconception — and the one that wastes the most time.

Easy Switch is the Belgian procedure that simplifies switching for fixed internet and TV subscriptions: the new operator collects the information from the old one and handles the cancellation. For this you need an Easy Switch ID, visible on your invoice or in your online account.

For mobile only, Easy Switch does not apply. You request portability directly when signing up with your new operator — no Easy Switch ID, no steps needed with your old operator.

How to Switch Mobile Operator in 3 Steps Without Losing Your Number?

You do not need to contact your old operator to cancel. The new operator handles this once portability is initiated.

Step 1 — Compare and sign up with your new operator

Identify the plan that matches your real usage (data, calls, 5G). In June 2026, DIGI offers plans from €5/month for 20 GB, Mobile Vikings from €10/month with no commitment. Sign up online — most operators then send a SIM card or an eSIM QR code.

Step 2 — Request portability when signing up

During checkout, indicate that you want to keep your current number. You will need:

• Your current mobile number
• Your current SIM card ICCID number (printed on the card, or in your operator's app)
• The name of your current operator
• Your preferred transfer date

Your new operator then contacts the old one to trigger the transfer on that date. You will receive a confirmation SMS with the exact time.

Step 3 — Activate your new SIM on the transfer date

At the time indicated in the SMS, insert the new SIM (or scan the eSIM QR code). Your number switches within 30 minutes. Your old SIM is automatically deactivated — no need to notify your former operator.

How Long Does Mobile Number Portability Take?

1 business day from the date you chose. The actual interruption is 30 minutes at most.

This is the legal timeline in Belgium: once you set a transfer date when signing up, your new operator has 1 business day to complete the portability (IBPT). If you schedule the switch for Monday, your new plan is active that same day.

If the transfer does not happen on the agreed date, you are entitled to €3 per day of delay (IBPT). You must claim it from your new operator within 6 months of the portability request. It is not automatic: keep the SMS confirming the planned date.

Can You Switch Operators Before Your Contract Ends?

Yes, at any time after 6 months, regardless of the original contract length. The rules depend on the contract type.

• Open-ended contract: can be cancelled at any time, no fees, no notice period.
• Fixed-term contract: free to exit from month 7. Within the first 6 months, you pay the remaining monthly fees up to month 6.
• Contract with included smartphone: you repay the residual value of the phone to your former operator according to the amortisation schedule in your contract — even after portability.

The case that changes everything: a tariff increase. If your operator raises its prices, you can exit without penalty. Orange raised its plans by +€2 to €4/month on 18 January 2026; Proximus did the same on 1 January 2026. In both cases, subscribers could leave without penalty until the first day of the month the increase took effect. Keep your tariff change notices — they are your legal basis.

What to Do If Your Number Transfer Does Not Happen on the Agreed Date?

Contact your new operator immediately and claim the €3/day compensation. Do not waste time calling the old one.

The process is straightforward: send an email or a message via your new operator's customer area, stating the planned transfer date (SMS as proof) and the actual date. Explicitly request the IBPT compensation of €3/day. You have 6 months from the original portability date to do so (IBPT, 2026). No claim = no compensation.