Unlocking a device

[Armin]

Hiya! I’ve recently noticed my old iPhone X is locked to O2. I’m trying to unlock it but I changed the o2 SIM card to Tesco so I can’t unlock it. Any way I can unlock it?

[Cleoriff]

@Armin 

The unlocking guide for O2 is here

Guide: Unlocking an O2 phone to use a different SIM card 

If you have issues then contact O2.

Guide: How to find help & contact O2