I have an iphone 3gs locked to o2 it was jailbroken and unlocked till my daughter updated it by accident.....the earliest saved shsh was firmware 4.1 so have downgraded back to that and the baseband is 05.15.04......obviously i dont have a clue what i am doing and i have googled it but cant make sense of anything so could anybody please help me as im on vodafone so need it to be unlocked :/