I was hoping someone could help. My mam is on O2 but her phone has broken today and she has had her number forever and wants to keep it. She uses her phone quite a lot so needs a phone asap but hasn't got the money to buy one right away. I have a Orange Sony Ericsson K800i which I don't use but I think it will be locked to Orange. Does anyone know how I unlock this phone? Any help would be greatly appreciated and will of course leave rep.