I have had my iphone 4 for 2 years now, last year I broke the back glass and replaced it with a platinum back housing. Yesterday I dropped something heavy on top of the iphone screen by an accident and it smashed it. If I go into an apple store and they see that the back isn't oem I'm guessing I have no shot of getting it repaired for free? If I can't get it repaired for free what would the best place to buy a good quality screen so I can replace it my self? I may also just end up replacing the front and back.