Does the HMD 2660 Flip work on 1&1?

Q: Does the HMD 2660 Flip 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. It supports 4G Calling, but we haven't found confirmation that it's enabled on 1&1. 4G data should work (shared bands: 1, 3, 7, 8, 20, 28).

Last checked 23 Oct 20265 sourcesWorked out from published specs

Yes, for now.

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. It supports 4G Calling, but we haven't found confirmation that it's enabled on 1&1. 4G data should work (shared bands: 1, 3, 7, 8, 20, 28).

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

HMD 2660 Flip

2G: GSM 850 / 900 / 1800 / 1900
3G: 850 MHz, 900 MHz, 2100 MHz
4G bands: 1, 3, 5, 7, 8, 20, 28, 40
4G Calling: yes – Listed in HMD's VoLTE-verified product list (TA-1711).

Other networks in Germany

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

Everything about the HMD 2660 Flip · All phones on 1&1 · Dumbphones that work in Germany

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Sources

How we decide: our method.