Up to €180 a year more after the promo

On 6 November 2026 we looked at the public prices of 19 standalone mobile plans, without a phone or internet package, from 6 providers. UNDO is one of them. Eight of those plans had a temporary discount.

For those eight, the price goes up after the promo by €24 to €180 a year, based on current price lists. The median is €48. If the promo runs for less than twelve months, the increase comes even sooner.

Comparing is still hard

According to a Test-Aankoop/Test-Achats survey (19 October 2026, more than 1,000 Belgians), 45% find it hard to know and compare the offers without promotions. More than 4 in 10 get lost in what operators offer.

Since 21 October, the federal campaign “Durf vergelijken / Osez comparer” by the FPS Economy, together with the BIPT, CREG and FSMA, has also been urging people to compare more often. A BIPT study on mobile services, which the campaign refers to, shows that 12% think their operator changed the content of their plan in the past year, and 19% that the price went up. Yet only 1 to 2% of those who noticed a change switched.

Three kinds of discount, each with a catch

  • A fixed period: after six or twelve months, the price goes up.

  • A lifetime discount with conditions: with some providers, it ends as soon as you move to a cheaper plan.

  • A discount tied to a bundle with internet: it disappears if you cancel that other contract. This type is not part of our analysis.

The price “afterwards” isn’t fixed either. One operator is changing its prices and data volumes on 1 January 2027: some plans get cheaper, others more expensive. If you sign up now, look at the price after the promo, not just your first bill.

How to compare for yourself

  • Ask whether the discount ends on its own, and whether it also ends if you move to a cheaper plan.

  • Put the end date of your promo in your calendar.

  • Compare for your own usage with the BIPT’s comparison tool.

  • Compare the thirteenth bill, not the first.

At UNDO: no promo price that goes up later

Each of the other providers in the analysis currently has at least one discount offer for new customers. UNDO doesn’t. Zero Waste costs €4 a month for 4 GB, 400 minutes and 400 texts, and suits you best if you use little data. Whatever you don’t use rolls over to the next month, and you call and browse on Orange’s 5G network. That entry price is the same as in June 2025.

On the BIPT’s tariff simulator, Zero Waste currently ranks first for the ‘low’ profile (1 GB, 60 minutes, 45 texts), with and without promotions (as of 6 November 2026). And according to our own figures, Zero Waste was more than enough for 85% of our new customers between July and September 2026.

“A promo price tells you what you pay during the promo, not what you pay afterwards. If you want to compare, put the thirteenth bill side by side, not the first.” – Laurent Bataille, General Manager of UNDO

Reference date 6 November 2026: public prices of 19 standalone mobile plans without a phone, VAT included, from Proximus, Mega, BASE, hey!, Orange and UNDO. UNDO commissioned the analysis and is included under the same rules; it is a sample, not a full market analysis. Sources: providers’ price pages, Test-Aankoop/Test-Achats (19/10/2026), FPS Economy (21/10/2026) and BIPT (Q2 2026 and tariff simulator, 6/11/2026).