on 14-09-2021 08:29
on 14-09-2021 09:13
You may have a roaming bar on your account so you need to contact O2 via SKYPE and ask them to lift it. Numbers to call in this guide Guide: Coronavirus Community Help and Support
Other things to try...
Manually search for another network
Reboot your phone
Or if you have an iPhone change your APN in settings to "mobile.o2.co.uk"
Veritas Numquam Perit