@Dave1977
First thing to to try is connecting to a different local network, and seeing if you can connect calls as if you can do everything else it could be a localised issue.
If this doesnt work, try putting the phone into Airplane Mode for a few minutes then coming out of it.
Other than that you will need to contact o2 Guide: How to find help & contact O2 Social Media options will be the best..
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iPhone 16 Pro Max - o2 and Spusu
Xperia 1V - Spusu
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company
