Does the Nokia 2780 Flip (US model) work on O2?

Q: Does the Nokia 2780 Flip (US model) work on O2?

Works with caveats. Calls and texts can fall back to 2G. O2 plans to start switching 2G off from 2029. We haven't found confirmation that 4G Calling works on O2. Its 4G bands (2, 4, 5, 7, 12, 13, 17, 25, 26, 41, 66, 71 (US bands)) don't match O2's, so expect no 4G data.

Last checked 22 Oct 20263 sourcesWorked out from published specs

Yes, for now.

Works with caveats

Calls and texts can fall back to 2G. O2 plans to start switching 2G off from 2029. We haven't found confirmation that 4G Calling works on O2. Its 4G bands (2, 4, 5, 7, 12, 13, 17, 25, 26, 41, 66, 71 (US bands)) don't match O2's, so expect no 4G data.

Fine for now. The catch is how calls get through: if they ride on 2G or 3G, they stop when O2 switches that off.

We worked this out from the phone's published bands and O2's own published network facts (see How we check). Nobody has confirmed it for this exact pairing yet.

O2 (UK)

3G: Switched off (completed 2025/26)
2G: Staying on for now; O2 plans to begin switching 2G off from 2029

Nokia 2780 Flip (US model)

2G: GSM 850 / 900 / 1800 / 1900
3G: 850 MHz, 1700/2100 (AWS) MHz, 1900 MHz
4G bands: 2, 4, 5, 7, 12, 13, 17, 25, 26, 41, 66, 71 (US bands)
4G Calling: unknown – Built for US networks; no UK/PT VoLTE confirmation found.

The same applies to networks that run on O2: giffgaff, Tesco Mobile, Sky Mobile. Smaller networks sometimes handle 4G Calling differently, so check with them too.

Other networks in the UK

EE Works with caveats
Vodafone UK Works with caveats
Three Doesn't work

Everything about the Nokia 2780 Flip (US model) · All phones on O2 · Dumbphones that work in the UK

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Sources

How we decide: our method.