After breaking my iPhone 4, I was borrowing my girlfriends iPhone 3GS until I upgraded to a new phone. When using the phone I noticed it was always quite warm but never thought anything of it. Once I upgraded, I left the phone for about 2 weeks. When I went to return the 3GS today, I noticed that the back has bulged out and the screen has detached from the bezel plus the screen appears to be slightly warped as if it's been pressed against the glass. Would it be worth my while to contact apple about a replacement or since its out of warranty would they not bother?