Does the Cat B35 work on 1&1?

Q: Does the Cat B35 work on 1&1?

Works with caveats. Calls and texts can fall back to 2G. 1&1 has no 2G of its own and uses Vodafone's 2G through national roaming, which ends in September 2028. We haven't found confirmation that 4G Calling works on 1&1. 4G data should work (shared bands: 1, 3, 7, 8, 20).

Last checked 23 Oct 20265 sourcesWorked out from published specs

Mostly, with a catch.

Works with caveats

Calls and texts can fall back to 2G. 1&1 has no 2G of its own and uses Vodafone's 2G through national roaming, which ends in September 2028. We haven't found confirmation that 4G Calling works on 1&1. 4G data should work (shared bands: 1, 3, 7, 8, 20).

Fine for now. The catch is how calls get through: if they ride on 2G or 3G, they stop when 1&1 switches that off.

We worked this out from the phone's published bands and 1&1's own published network facts (see How we check). Nobody has confirmed it for this exact pairing yet.

1&1 (Germany)

3G: No 3G network
2G: No 2G of its own: uses Vodafone's 2G via national roaming, so Vodafone's September 2028 date applies

Cat B35

2G: GSM 850 / 900 / 1800 / 1900
3G: Not published or not checked yet
4G bands: 1, 3, 7, 8, 20
4G Calling: unknown – No network or maker VoLTE confirmation found.

Other networks in Germany

Telekom Works with caveats
Vodafone Works with caveats
O2 (Telefónica) Works with caveats

Everything about the Cat B35 · All phones on 1&1 · Dumbphones that work in Germany

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Sources

How we decide: our method.