. . . I have an iPhone 4 locked on Orange . i've unlocked it with SAM with a O2 sim and worked quite good. . . and now i wanted to FACTORY UNLOCK it beacuse after i request orange for unlock they sent me a mail saying if u have been unlocked before by any other method your phone may be damaged while this process(factory unlock). how can i remove the SAM unlock . . . i need to rever UNLOCK . . . is it possible ? How ?