So i dropped my old iphone 3g and the home button decided to stop working, and wont charge anymore. So my girlfriend gave me her old iphone (has a iphone 4 now), which 'apparently' she's tried to take the passcode off it but with no prevail gave up and decided to let me try. But anyway, it seems that i can't do it myself and have tried a few various methods on youtube/google. So i was wondering how exactly i go about doing this?