o2 Home M Flex or 1und1 DSL 100 Flex: Which Is Better in Germany? (2026)
The short answer
Same line, same specs: 100 Mbit/s down and 40 up over VDSL, unlimited, 7 to 21 days to install and 1 month notice. o2 costs EUR 39.99 a month against EUR 44.99, binds for 1 month against 3, and supports you in English where 1&1 records limited English.
Row by row
Fees verified August 2026 against each provider's published data
| Criterion | o2 Home M Flex | 1und1 DSL 100 Flex |
|---|---|---|
| Monthly priceWhat you actually pay per month | EUR 39.99Wins | EUR 44.99 |
| Minimum termLock-in length, and what leaving costs | 1 monthWins | 3 months |
| Setup feeThe one-off charge before the line works | EUR 49.99 | EUR 49.95Wins |
| English supportApp, contract and helpline language | FullWins | limited |
So which one
Pick o2 Home M Flex if
- You want the shortest commitment and the lower price: 1 month and EUR 39.99 against 3 months and EUR 44.99.
Pick 1und1 DSL 100 Flex if
- Only the setup fee favours 1&1, at EUR 49.95 against EUR 49.99; every other recorded figure is equal or better at o2.
Other comparisons
2 more pairsHow we compared these two
The criteria are fixed
Every comparison on this site uses the same 4 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.
Frequently Asked Questions
Which is better, o2 Home M Flex or 1und1 DSL 100 Flex?
Same line, same specs: 100 Mbit/s down and 40 up over VDSL, unlimited, 7 to 21 days to install and 1 month notice. o2 costs EUR 39.99 a month against EUR 44.99, binds for 1 month against 3, and supports you in English where 1&1 records limited English.
When should I pick o2 Home M Flex?
You want the shortest commitment and the lower price: 1 month and EUR 39.99 against 3 months and EUR 44.99.
When should I pick 1und1 DSL 100 Flex?
Only the setup fee favours 1&1, at EUR 49.95 against EUR 49.99; every other recorded figure is equal or better at o2.