What Test-Achats found

According to BIPT figures, the average Belgian pays €21.43 a month for their mobile plan. Test-Achats compares plans by usage profile and lists the ten cheapest each time. Their conclusions:

  • With the cheapest plan for your usage you save around €87 a year on average.

  • For one of their usage profiles, Orange, Proximus and Telenet fall outside the top 10. With DIGI, hey!telecom or UNDO you save more than €34 a year on average there, according to Test-Achats.

  • Most people get by with 10 to 15 GB a month, far less than the 50 or 100 GB that is often sold.

Prices and promotions change regularly. So always check the latest comparison from Test-Achats or BIPT’s rate simulator at bestetarief.be.

Switching is easier than you think

  • Your number comes with you. Your new operator handles the switch and cancels your old subscription for you.

  • You can leave even with a contract. According to Test-Achats, you can cancel a fixed-term contract free of charge after six months.

  • With an eSIM it’s quick. You get a QR code by email and install your eSIM in a minute, with no shop and no SIM card.

The saving nobody counts: data you don’t use

Price comparisons look at what you pay, not at what you leave unused. With many operators you lose unused data, minutes and texts at the end of the month. That’s why many people take a bigger bundle than they need, just in case.

At UNDO, what you don’t use carries over to the next month. So you build a reserve for a busy month, and a smaller plan is enough.

Check it yourself in five minutes

  1. Check your last invoices for how many GB, minutes and texts you really use.

  2. Compare based on that usage at Test-Achats or on bestetarief.be.

  3. Don’t just look at today’s price, but also at the price after any promotion.

  4. Switching? Keep your number.

Start by comparing, not with us

First see what fits your usage. If UNDO comes out of it, start with Zero Waste at €4 a month for 4 GB, 400 minutes and 400 texts. Every plan can be cancelled any month, what you don’t use you keep, for every new subscription we plant a tree, and you support certified climate projects with CO₂ credits.

Sources: Test-Achats (July 2026), based on BIPT figures. Figures as published at the time of writing; rates may change.