No caller ID
So recently I’ve been trying to sort out my caller ID. It is not my side that’s the issue. Every single person who calls me regardless of whether they are in my contacts comes through as no caller Id or unknown caller. I’ve tried through to O2 but am getting no support whatsoever. Getting a pain now recently just got a new job as well so I can’t see who is calling me. Please can somebody advise?
thanks
iPhone 13, iOS 16