on 21-11-2020 07:19
on 21-11-2020 07:42
A 5g SIM will still work in a 4g phone.
Is the SIM activated?
Has it been inserted correctly?
Do you have other SIM cards you can try in the phone etc.....?
on 21-11-2020 08:09
on 21-11-2020 08:18
on 21-11-2020 08:18
Sounds like you SIM may be faulty.
Are you able to call O2 from another phone or Skype?
Guide: Coronavirus Community Help and Support
on 21-11-2020 08:19
on 21-11-2020 08:27
on 21-11-2020 08:27
They are open now.