Try this to refresh the network connection:
Go to Settings and then Carrier.
Toggle OFF the automatic mode and manually change the carrier to something other then O2-UK.
Leave the menu and wait until it fails to connect to another carrier.
Once it fails repeat the process and this time choose O2-UK or toggle ON automatic.
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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