Archived product
UNDO S is no longer available for new customers. If you are still using this product, we've made it super easy for you to find alternatives for UNDO S, both from UNDO itself and from its competitors. The information on this page has not been maintained or updated since august 2025. This page is purely for comparison with more current offers and as a historical reference overview.
Evert E. — Telecom consultant
In this review, we explain in clear language where UNDO scores strongly and what points of interest you should take into account before choosing this phone plan UNDO S.
Tip! Compare UNDO S with its competitors.
Evert E. — Telecom consultant
| Last update | August 2025 |
| Data | 20 GBUse in BE and EU |
| Data outside bundle | €0.01 /MB |
| Calls | 500 min. |
| Calling outside the bundle | €0.10 /min |
| Texts | 100 texts |
| SMS outside the bundle | €0.05 /text |
| 4G/5G network | Orange 4G & 5G |
| 5G speed | - |
| Monthly fee | €14 /mo |
| Contract duration | Indefinite |
| Notice period | Indefinite |
| Available in | Belgium |
| Target audience | Consumer |
UNDO is a Belgian telecom provider offering mobile subscriptions through a fully digital approach. Customers can use the app to track usage, change settings and manage their subscription without much paperwork or traditional shop visits. UNDO focuses on a simple mobile offer with an emphasis on transparency and ease of use. That makes UNDO especially suitable for people who want to manage their mobile plan online and keep direct control over data usage, calls and billing.
Forewarned is forearmed. UNDO S serves as the benchmark product in this comparison. In which areas does UNDO S outperform other phone plans, and in which not so much?
