FASTfiber email & contact form
For general questions, email [email protected].
FASTfiber customer service phone number, opening hours and contact details
By Maaike Zahn | Last updated on 13 March 2025
FASTfiber has no traditional phone-based customer service — all support runs through My Fastfiber and email. For free, independent advice or to subscribe, call CallMePower on 02 588 25 47. On this page you'll find all the contact options for FASTfiber.
0 phone numbers
How do you contact FASTfiber?
Four channels, one goal: get your question answered as fast as possible. Pick whatever best matches your situation.
No phone-based service
FASTfiber has no traditional phone line. All support runs through the online channels below.
Online customer area
My Fastfiber — check invoices, manage your subscription and chat with customer service.
Open customer areaEmail or social media
Email directly to [email protected] or message via Facebook, X or Instagram.
See channelsFile a complaint
Try FASTfiber first, then the Telecommunications Ombudsman if you can't reach a resolution.
See procedure
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My Fastfiber — the online customer area
In My Fastfiber you can handle many things yourself — often faster than by phone. Check invoices, change your subscription and get notifications about outages or new options.
Reach FASTfiber via email or social media
Prefer not to call? You can also reach FASTfiber digitally — via email or via the official social media channels. Both options are listed below, with the typical response time and the right channel for your question.
Procedures with FASTfiber
Moving, becoming a customer or cancelling — click on each card to see the full procedure.
Become a FASTfiber customer
Subscribe to a new FASTfiber plan.
- Via CallMePower — free advice, comparison with other operators, help cancelling your current plan.
Notify FASTfiber of your move
Change your address with FASTfiber — mobile or pack.
Your address change makes sure invoices, post and any visiting engineers reach you at the right address. The approach depends on the type of subscription.
Mobile-only subscription
Change your billing address directly in My Fastfiber. Your number and plan remain unchanged.
Internet or pack subscription
Notify your move 2 to 4 weeks in advance — an engineer may need to visit the new address to activate the connection.
Details FASTfiber will need
- Customer or contract number
- Current and new address
- Planned moving date
- Phone number where the engineer can reach you
Cancel or switch from FASTfiber
Easy Switch, number portability or via CallMePower.
- Via CallMePower — cancel and subscribe to a new plan in one call.
- Easy Switch when switching internet or TV providers — no interruption to your connection.
- Number portability when switching mobile plans — keep your phone number.
- Via My Fastfiber — manage your cancellation yourself.
Filing a complaint with FASTfiber
Stuck with an unresolved problem? Follow these three steps — the Telecommunications Ombudsman is your last resort.
1
Contact customer service
Describe the problem to FASTfiber customer service, mention earlier contact attempts and keep the reference number of your case.
2
File a formal complaint
No resolution? Ask for written confirmation in every interaction (by email or in My Fastfiber) so you have a paper trail.
3
Ombudsman
Escalate to the Telecommunications Ombudsman — an independent body that mediates between you and the operator.
Frequently asked questions about FASTfiber customer service
Can't find your answer below? Call our Belgian advisor on 02 588 25 47 — free and pressure-free.
FASTfiber has no own customer service phone line. In Belgium, customers are exclusively guided by CallMePower: call 02 588 25 47 for free advice or to subscribe to a fibre plan.
Yes, send your question to [email protected].
No, FASTfiber operates entirely online. Sales and advice run through the website or through CallMePower.
Enter your address on fastfiber.be or call CallMePower on 02 588 25 47 — an adviser will instantly check whether your street is already connected.
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