trying to make a call and get message not registered on network

That could happen in the Midlands area where iD Mobile have shutdown their 3G network, @Clem1310. 

In this area, you’ll need a correctly configured handset, which is approved for use with the iD Mobile 4G Calling service (VoLTE).

I'm in Newcastle area so I think coverage is OK here

Does your iD SIM work in another handset, @Clem1310? 

If not you may need a replacement SIM card, or maybe your iD account is blocked for some reason.

Forum members can't look at customers accounts, for privacy and security reasons.

Have you used the online iD Live Chat service to contact customer service? Unfortunately, the advisers work between 9am and 8pm on weekdays.

Yeh tried in another handset, no joy will only let me call out using WiFi,  will be out and about tomorrow so I'll see if I pick up the network 

Hi @Clem1310 

Are you only having issues with calling out?

How are texts and data?

Is this only happening in certain locations or wherever you go?

Tom