on 06-02-2024 09:58
on 06-02-2024 10:55
Not a lot to go on. Type of phone would help.
Do you have Calls and Text if so try a network reset
on 06-02-2024 11:24
Check help Guide: Sim Swap: a mini guide 2017 update
https://www.o2.co.uk/help/device-and-sim-support/esim