Does the Light Phone III work on O2?

Q: Does the Light Phone III work on O2?

Works. Light's own compatibility checker says the Light Phone III will work with O2 in the UK (it lists O2, VodafoneThree, EE and BT; checked 23 Oct 2026). Light's spec sheet lists 4G and 5G only, so calls go over 4G Calling.

Last checked 23 Oct 20264 sourcesLight's checker (23 Oct 2026)

Yes.

Works

Light's own compatibility checker says the Light Phone III will work with O2 in the UK (it lists O2, VodafoneThree, EE and BT; checked 23 Oct 2026). Light's spec sheet lists 4G and 5G only, so calls go over 4G Calling.

Nothing on O2's published plans affects this pairing right now.

Source: Light's own compatibility checker, checked 23 Oct 2026 (a maker statement, not a network list).

O2 (UK)

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

Light Phone III

2G: Not listed on Light's spec sheet
3G: Not published or not checked yet
4G bands: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 38, 40, 41, 42, 48, 53, 66, 71 + 5G
4G Calling: unknown – Light says the Light III is one worldwide model, but we haven't found a UK or Portuguese network that confirms 4G Calling on it. EE owners on r/LightPhone report 4G service.

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
Vodafone UK Works
Three Works

Everything about the Light Phone III · All phones on O2 · Dumbphones that work in the UK

Using a Light Phone III on O2? Tell us how it went and we'll update this page. Report your result.

Sources

How we decide: our method.