Whereabouts is this happening, @cjcox? 

Is the iD 3G network service switched OFF in your area?

What make and model handset are you using with your iD SIM? 

Barnet EN5 4LR Moto G5 

Thank @cjcox, looks like iD Mobile have switched OFF their 3G network service in your area.

Your device doesn’t seem to be supported by iD Mobile for 4G VoLTE calls on their network, sorry.

https://www.idmobile.co.uk/help-and-advice/approved-handsets

This iD online article might help.

Hi @cjcox 

Unfortunately as the Moto G5 isn’t an officially supported on our network, you may encounter issues with using it in conjunction with an iD Mobile SIM.

https://www.idmobile.co.uk/help-and-advice/approved-handsets

Tom

I have now decided to leave iD because my 4G phone has not been accepted.

Bye bye one and all.

@cjcox -

Best of luck with your new provider.

Thanks.