hi, I've recently noticed at the top right corner of my iPhone 4, a blob of brightened pixels have happened to appear, I don't know what they are or what caused it, my phone hasn't been in any contact with water. the radius of the dead pixels is still scannable and reads your finger gestures if you touch in that area. is there any way I can get this resolved, or fixed? will Apple replace it for another iPhone 4? I don't have a warranty, so I guess that's a no? thanks for your help.