3G devices should still work over 2G. It's much slower, but it works and should do so until well into 2030 in the UK. The problem with 3G as I understand it is

3G devices should still work over 2G. It's much slower, but it works and should do so until well into 2030 in the UK. The problem with 3G as I understand it is that it uses more power and is less efficient than 4G/5G. They're starting to re-deploy the 3G bands as 4G/5G, so the other Gs will eventually benefit from this shutdown.