I’m also experiencing complete loss of signal in WV14 post code. iPhone 14 Pro Max is on Monthly Payments provided from EE. I have turned on Airplane Mode multiple times with no change. I have also restarted the phone, also with no change
Use the "check service status" option on https://ee.co.uk/help/mobile-coverage-checker in the first instance, to check for local service outages. A loss of coverage will remove the ability to make/receive calls, send/receive texts or use mobile data.
If you're in the UK and have a WiFi connection, you can use WiFi-calling to keep using your phone as normal without needing network coverage.
