on 22-05-2020 13:27
on 22-05-2020 13:29
It's possible that O2 have moved you to a new sim card.
Did you get a new sim with your new phone to try it?
If not, you'll need to contact O2 Guide: Coronavirus Community Help and Support
Try the Skype option or borrow a phone of someone.
on 22-05-2020 13:41
on 22-05-2020 13:47
on 22-05-2020 13:47
If you still have your old sim, try it.
If not or anyway, you'll need to call O2 on the numbers in link above.