I would NEVER recommend purchasing a mobile electronic device second hand. They are selling it for a reason, and I’m betting it’s not because they are doing you a favor. Work hard and save a little more and purchase "your" iPhone from apple.com. That way you know who’s been licking your mouth piece and where it’s been. You’ll sleep better.

good luck.

Where are you buying it, so i can purchase it before you, i no how to fix it =)