Telekom vs O2 (2026): Is the Telekom Premium Worth It?
The short answer
Telekom wins the network, O2 wins the price. Both sell 20 GB of allnet prepaid for about 10 EUR per 28 days, so the gap only opens on contracts: O2 Mobile S starts at 19.99 EUR a month against 29.95 EUR for MagentaMobil XS. Telekom is the best-rated German network and answers in English. O2 has the highest measured 5G availability but German-first support and rural coverage that still trails Telekom.
Telekom
Deutsche Telekom AG
Telekom sells the D1 network under its own MagentaMobil name. congstar and fraenk are its own value brands riding the same radio network, so a cheap congstar SIM gives you Telekom coverage.
Cheapest entry: congstar Prepaid Allnet M, 30 GB for 10.00 EUR per 28 days on the Telekom network
O2
Telefónica Germany GmbH & Co. OHG
O2 is the retail brand of Telefónica Germany and owns its network. ALDI TALK, Blau and Tchibo mobil are separate value brands selling airtime on that same network.
Cheapest entry: ALDI TALK Kombi-Paket S, 25 GB for 8.99 EUR per 28 days on the O2 network
Row by row
Fees verified August 2026 against each provider's published data
| Criterion | Telekom | O2 |
|---|---|---|
| Network you actually useCoverage follows the radio network, not the brand | Telekom (D1), own networkTie Operated by Telekom Deutschland GmbH | O2 / Telefónica, own networkTie Operated by Telefónica Germany GmbH & Co. OHG |
| Published network verdictIndependent tests are the only neutral signal here | Best-rated German network, connect 01/2026 and Ookla Q1-Q2 2026Wins Data in Switzerland is treated like EU data | Highest measured 5G availability in Germany, Ookla H1 2025 Rural coverage still trails Telekom and Vodafone |
| Allnet prepaid at around 10 EURThis is the tariff most new arrivals actually buy | MagentaMobil Prepaid M, 9.95 EUR per 28 days, 20 GBTie Effective 10.78 EUR a month across 13 cycles | O2 my Prepaid S, 9.99 EUR per 28 days, 20 GBTie Effective 10.82 EUR a month across 13 cycles |
| Cheapest 24-month contractWhat a SIM-only contract costs before any promo | MagentaMobil XS, 29.95 EUR a month for 20 GB 39.95 EUR connection fee | O2 Mobile S, 19.99 EUR a month for 15 GBWins 39.99 EUR connection fee; O2 Mobile on Demand M gives 50 GB at the same price |
| Peak speed on the prepaid planA capped plan feels slow on a modern phone | Up to 300 Mbit/s on 5GTie No speed-cap surcharge | Up to 300 Mbit/s on 5GTie Throttled to 1 Mbit/s after the quota, not cut off |
| What the SIM costs on day oneThe first payment people forget to budget for | 9.95 EURTie Includes 10 EUR of starting credit | 9.99 EURTie Starter pack includes 10 EUR of starting credit |
| CommitmentHow quickly you can walk away | Prepaid: none. Contract: 24 monthsTie Contract adds a 39.95 EUR connection fee | Prepaid: none. Contract: 24 monthsTie Contract adds a 39.99 EUR connection fee, often waived in flash sales |
| EU roaming allowanceWhether the plan travels with you | 20 GB, the full plan allowanceTie Switzerland counts as EU on Telekom prepaid | 20 GB, the full plan allowanceTie |
| English-language supportDecisive in the first weeks after arriving | Full English supportWins | None, support is German-first |
So which one
Pick Telekom if
- The network rated best in Germany by connect 01/2026 and Ookla Q1-Q2 2026 is exactly what you are paying the premium for
- You need help in English: Telekom offers full English support, O2 does not
- You want unused prepaid data to roll over into the next 28-day cycle
- You leave the EU: MagentaMobil XS includes 2 GB a year of non-EU roaming data
- You want the same radio network for less: congstar Prepaid Allnet M is 30 GB for 10.00 EUR
Pick O2 if
- You want the cheapest contract from a network owner: O2 Mobile S is 19.99 EUR a month
- You want volume on that budget: O2 Mobile on Demand M is 50 GB at the same 19.99 EUR
- You are up to 29: O2 Mobile S young is 14.99 EUR a month, the widest age gate of the three networks
- You dislike hard cut-offs: the Weitersurf-Garantie drops you to 1 Mbit/s instead of stopping data
- You want the cheapest way onto the network: ALDI TALK Kombi-Paket S is 25 GB for 8.99 EUR
Other comparisons
4 more pairsHow we compared these two
The criteria are fixed
Every comparison on this site uses the same 9 rows in the same order, so two pages can be read against each other. We do not add a row because one side happens to win it.
A win is a stated threshold
A row is won on the published number or capability, not on judgement. Ties are declared rather than broken. Figures come from provider price lists and official sources.
How we get paid
Both links earn a commission at the same rate, so the winner of a row is never the higher-paying one. Fees come from each provider's own published price list, not a comparison feed.
Sources: provider price lists and official data, accessed August 2026. Next review: November 2026.