@Matt1978Have you been able to connect to WiFi and check for any updates.
This is usually cleared by a reboot of your phone, but i would also recommend removing the sim card and rebooting the phone, then re insert the sim card
Also try going into Mobile Network settings and ensure 4G is set to autoconnect and then ensure the device is connecting to o2 automatically
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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