From the Ofcom website:

‘…older device will still be able to make calls and send text messages after 3G switch-off. These services can use the 2G network, which isn’t being switched off yet.’

‘We expect that mobile providers will start making plans to switch off their 2G networks at some point after they have switched off their 3G networks. None of the providers have set a specific date yet.’

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hazardwarning.me.