Okay so I apologize if this was posted elsewhere, I swear I looked and couldn't find anything related to this. Plus I've never really looked into unlocking an iphone before. Here is my question... Is it possible to unlock sprint iphone 4S to use on verizon network? I upgraded from the 4S to a 5 on sprint, and a friend wants to buy my 4S but they are on verizon. Can this work???? Thank you for your time!