Head-to-head
fraenk vs SIMon vs Blau Flex (2026)
Updated May 2026. Three monthly-cancellable flanker brands on the three big German networks. fraenk (Telekom) at €10/month for 20 GB wins on simplicity and Switzerland-inclusive roaming. SIMon mobile (Vodafone) competes on data buckets up to 250 GB. Blau Allnet S Flex (O2) at €7.99/month for 20 GB 5G is the cheapest. All three are monthly cancellable, no 24-month commitments. Pick by network preference.
Side-by-side
| Feature | fraenk | SIMon mobile | Blau Allnet S Flex |
|---|---|---|---|
| Network | Telekom (D-Netz) | Vodafone | O2/Telefónica |
| Data | 20 GB (referral can raise) | Up to 250 GB portfolio | 20 GB |
| Price | €10/month | Verify current pricing | €7.99/month |
| Annual cost | €120 | Verify | €95.88 |
| 5G | Yes (~25 Mbit/s cap) | Yes (up to 150 Mbit/s) | Yes |
| EU roaming | Included + Switzerland | Included | Included |
| Switzerland | Included | Verify per tariff | Verify per tariff |
| Contract term | Monthly | Monthly or 24-mo | Monthly (Flex) |
| Signup | App-only | Online | Online + O2 channels |
| eSIM | App-led | Verify | Contract eSIM verified |
Verdict
Pick fraenk if…
- You want the simplest single-tariff brand
- You travel to Switzerland regularly
- You want premium D-Netz coverage
- You like app-only signup
Pick SIMon mobile if…
- You want larger data buckets (up to 250 GB)
- You prefer Vodafone over Telekom
- You want faster 5G speed cap (150 Mbit/s)
- Live in major German cities
Pick Blau if…
- You want the cheapest of the three (€7.99/mo)
- O2 coverage works for you (city user)
- You want both contract and prepaid eSIM options
- You're ok with verifying live pricing
Frequently asked questions
Are fraenk, SIMon, and Blau really three different brands?expand_more
Yes — three different parent companies and three different networks. fraenk is Telekom-owned (D-Netz); SIMon mobile is Vodafone-owned; Blau is O2/Telefónica-owned. They're flanker brands their parents use to compete on price without diluting the main brand.
Which one has the fastest network?expand_more
SIMon mobile on paper — up to 150 Mbit/s on Vodafone with 5G. fraenk caps lower (~25 Mbit/s on Telekom) but Telekom's underlying coverage is more consistent. Blau follows O2's 5G capabilities. For most users (web, social, video), all three are fast enough.
Is monthly-cancellable really better than 24-month?expand_more
For most users, yes. Monthly cancellation means you can switch when prices drop or your needs change. The trade-off is no 24-month introductory discount. Heavy users who know they'll stay 2 years can save 30-40% with a 24-month contract from 1&1, sim.de, or winSIM. Most people switch within a year anyway.
Why is fraenk €2 more than Blau but called the "simple" one?expand_more
fraenk includes Switzerland in roaming (rare) and runs on the most extensive German network. Blau on O2 doesn't include Switzerland by default. If you take 1-2 Swiss trips per year, the €2/month difference pays back via Swiss roaming savings. If you never go to Switzerland, Blau is the better value.