I was wondering if anyone else has experienced this.. Whenever the background of my phone is white (using certain apps or whatever) I can notice a very faint blue-ish tint smudge on my screen.. there's actually 2 of them but one is more noticeable.. I don't notice them at all unless I'm opening an app and the screen background is totally white for that second the app is loading up or something.. so it's so minor it's almost not even worth thinking 'what is that'.. but I'm just curious.. It looks like maybe I pressed too hard on the screen is the only way I can describe it.. although I've never pressed hard on the screen.. I have dropped it multiple times over the course of owning it (9 months?) and have had the glass replaced probably 2 or 3 times now.. Does anoyone know what's causing this? Possibly dropping it too many times? It doesn't look like a dead pixel (that would be like a tiny square wouldn't it?).. It's an iPhone 4s. Thanks.