Why the lowest monthly price is misleading

Comparison sites rank plans by the price in the ad. Three things you don’t see there:

  • The price after the promotion. An introductory price often runs for twelve months. After that you pay the standard price, which can be several times higher.

  • Data that expires. With many operators you lose your unused data at the end of the month. You then pay for volume you never use.

  • The price of an extra GB. If you go over your bundle, some operators charge several times their normal price. A small plan only pays off if that extra price is reasonable.

What you really compare

  1. The price from month 13, not the introductory price

  2. Whether unused volume expires or carries over to the next month

  3. What an extra GB costs

  4. The network, and whether you get 5G

  5. Your notice period, with or without a contract

  6. Your own usage, based on your last three invoices

That last one matters most, and it’s done least. According to BIPT, average mobile data use rose in five years from 3.9 GB to 11.9 GB a month in 2025. Bundles grew even faster: in 2025 nearly 8 in 10 residential customers with a subscription had more than 10 GB included, compared with 6 in 10 two years earlier. So many people pay for more than they use.

When another operator is better value

UNDO isn’t the best-value choice in every situation:

  • There are entry-level plans in Belgium under €4.

  • Promotions sometimes lower the price temporarily. If you switch operator every year, that can pay off.

  • If you regularly use 30 GB or more, you’ll sometimes find a lower price per GB elsewhere.

Want to compare all Belgian operators based on your own usage? Then use BIPT’s independent rate simulator at bestetarief.be.

What UNDO does differently

  • One price, with no introductory discount. Zero Waste costs €4 a month, ever since its launch in June 2025. New and existing customers pay the same.

  • What you don’t use, you keep. A quiet month builds a reserve for a busy one.

  • You’re not tied to anything. Every plan can be cancelled any month, your eSIM installs in a minute, and your full bundle works in the EU too.

The four plans, all on Orange’s 5G network:

  • Zero Waste: 4 GB, 400 minutes and 400 texts for €4 a month

  • Rise: 8 GB, 800 minutes and 800 texts for €8 a month

  • Boost: 30 GB, unlimited calls and 100 texts for €18 a month

  • Wild: 40 GB, unlimited calls and texts for €24 a month

With every new plan we plant a tree at activation and you support certified climate projects with CO₂ credits.

Sources: BIPT, annual telecom market figures 2025. Rate simulator: bestetarief.be.