hiya mate, o2 will unlock your phone for free if your in a contract with them, i had 2 iphones unlock on the same contract, if your out of contract i think its £15 last time i looked, you just fill in this form mate, thats all i did, the iphone was in my name which i presume is same for you, if not you may have to ring them im not sure on that, hope that helps abit mate