I know this has been discussed before, but it's too scattered to make any sense of. I'm on my 2nd iPhone 4, and this one doesn't have the issues the first one had but I noticed the right side of the screen is considerably darker or more dull than the left side. The top is also noticeably darker than the bottom, with everything sort of a gradient in between. Anyone that has had this issue: did it go away with time? Or were you successful in getting it exchanged at the Apple Store?