Cancel your Proximus subscription by mail
For Proximus the route is a written letter: cancellation requests are taken by post, and certified mail shows when yours arrived. Proximus receives written requests in Brussels, Belgium.
Let Postbye cancel Proximus for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Proximus.
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- 2 Proximus cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Proximus by mail
Start with your account details
Have the account number, the phone number or service address being cancelled and the name on the account to hand. The details in the letter need to match what Proximus has on file.
Write the cancellation request
Proximus is based in Belgium, so the letter goes out in French, built from our French template. Subject line: “Objet : Demande d'annulation – [your name]”. It asks for the subscription to end, for further charges to stop and for written confirmation.
Send the letter by certified mail
Post it by certified mail to Proximus in Brussels, Belgium, using the exact address below, and note the tracking number.
Save the tracking record
Keep the tracking record with your copy of the letter. If Proximus bills you after the date it received the request, you have the dates to point to.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Proximus cancellation letter goes
Written requests to Proximus go to Koning Albert II-laan 27, 1030 Brussels, Belgium.
The envelope is going to Brussels, Belgium, so the postcode 1030 must be on the front.
The database also lists Boulevard du Roi Albert II 27, 1030 Brussels, Belgium for Proximus. Use the first address above unless your agreement names this one.
Your name, address and email appear in a short block labelled Titulaire du compte, Adresse de facturation enregistrée and E-mail enregistré, under the greeting “À qui de droit,”.
Prefer to write it yourself? Use our letter template
Every address we hold for Proximus, with the envelope wording
Before you cancel Proximus, check these
- Name the exact line or service address. Accounts with several lines can leave one of them running.
- Ask for a final bill in writing and return any rented equipment by tracked mail.
- Check for an early-termination fee or a remaining equipment balance before the cancellation date.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Proximus for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Cancelling a phone or internet plan
Phone and internet providers tie cancellation to contracts, equipment balances and notice periods, so the request should name the exact line or service and ask for a final bill in writing.
A mailed letter is slower than a phone call but it is the version that proves what you asked for and when.
Proximus cancellation at a glance
- How Proximus accepts cancellations
- By mailed letter
- Mailing address on file
- Proximus Koning Albert II-laan 27 1030 Brussels Belgium
- Second address on file
- Proximus Boulevard du Roi Albert II 27 1030 Brussels Belgium
- Country
- Belgium
- Letter language
- French (template fr)
- Category (from the company name)
- Phone & internet
- Added to the database
- June 19, 2026
- Data last checked
