on 04-07-2020 13:59
on 04-07-2020 14:01
You'll need to unlock it Guide: Unlocking an O2 phone to use a different SIM card
on 04-07-2020 14:02
on 04-07-2020 14:06
on 04-07-2020 14:06
There are additional things to check in the link I gave you but you'll need to give O2 time to unlock it.
They will text or email you when done.