on 24-05-2020 14:51
24-05-2020 14:55 - edited 24-05-2020 14:57
24-05-2020 14:55 - edited 24-05-2020 14:57
If it is PAYG, it needs to be used periodically or it is disconnected, @Ihbm.
Numbers for O2 here, Skype or freefone from landline: Guide: Coronavirus Community Help and Support.
If Contract, and your nearby O2 mast is not out of service ( Guide: Is the network down for me or everyone?), then a call to O2 is definitely needed.
on 24-05-2020 15:23
on 24-05-2020 15:23
Classic symptoms of a barred phone unfortunately.
Check your IMEI number here https://www.imei.info/