If you unlock your sim and need to take your iphone to apple for servicing (dead pixels, for instance), is there an easy way to restore it to factory settings so they don't know? (Sorry if this has been answered before, but there are a lot of threads on hacking and I have no idea where to start.) I want to unlock one, but my only concern is that when something like that happens I will try to take it in but they will deny me service (I had to take my ipod touch back 4 times because of dead pixels)
Thanks!