Incoming calls don't connect and sends callers to O2 message centre.
I have recently bought a new phone, I didn’t bring my old number and so received a new ID mobile number with the phone/sim. It all works fine other than the fact that when somebody calls me it immediately sends them to the O2 voicemail to leave a message. I’m not on O2, I haven’t been on O2 for about 20 years. I’ve been into Currys but they haven’t been able to help.