Gigaset Comfort 600 SIM, front, in its charging base

Does the Gigaset Comfort 600 SIM work on Sky Mobile?

Works (on 2G)

Calls and texts work on Sky Mobile using 2G. They'll stop working when 2G is switched off unless 4G calling gets enabled.

Last checked 15 October 2026.

How we worked it out

2G calls: The phone supports 2G and Sky Mobile's 2G network is still on (Sky Mobile uses O2's network).
4G bands: Shares 4G bands with Sky Mobile: B1, B3, B20, B28.
4G calling: Sky Mobile only enables 4G calling on approved phones, and we haven't confirmed this one.

Sky Mobile runs on O2's network, so it uses O2's masts and bands.

About 2G: O2 plans to start switching off 2G in summer 2029.

About 4G calling: Sky only guarantees 4G calling on phones bought from Sky Mobile.

Where to buy

Out of stock everywhere we've checked.

Onedirect Out of stock £59.99 checked 23 Oct 2026 · Page says "Call us for availability"; stock not confirmed. Business retailer, price incl. VAT.

Did it work for you?

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Could you make and receive calls? Yes No Sometimes

Did the phone show 4G calling (VoLTE) as on?

Look for a VoLTE or HD icon by the signal bars, or a 4G calling setting.

Yes No Don't know

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See all networks, features and specs for the Gigaset Comfort 600 SIM · Other phones on Sky Mobile