@kedev
Did you use a new sim or your old one?
If the old one, I'd start with a new sim.
O2 will post you one or you can get one in any O2 store.
If it's the new sim, I'd contact Apple to check the phone out https://www.apple.com/uk/retail/geniusbar/
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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