O2

Its a Motorola. Everything sems to be working but via Giffgaff. Since my contract is with O2 am I liable to be seeing extra charges for using another network? If so I have a problem if not, no problem.

Yes. It came out of my old O2 phone. I've just double checked and it's definitely O2. But the phone reports having a Giffgaff SIM in

Sorry again  is not on the list

Automatic selection shows Giffgaff. The phone is working normally making and accepting calls etc. If I try manual selction of network O2 is on the list of available networks found. Contract is with O2.I really appreciate your help.

Sorry - is not offering O2 as a choice.