I bought my iPhone 4 last October and I just noticed a dead pixel, I'm 99% certain it just popped up and wasn't there before. Just thought I'd let you guys know that the pixels are distinguishable but just barely so. Its so tiny thats its almost impossible to see, if it was any smaller it actually would be impossible to see. If I hold the phone like 25cm from my face it becomes invisible. I'm actually surprised I managed to see it since its so small, I just have incredibly sharp eyes. I tried to take a picture of it but my 12MP camera simply cannot capture it, its that small. I also tried showing several people and only one other can actually see it. I think if I went to the Apple store asking for a replacement, the assistant would probably be unable to see it. Anyway, I won't be asking for a replacement since its such a non issue but I thought I'd post it here since I have seen absolutely no mention of dead pixels in the Retina Display.