I've had 3 iPhone 6's now, waiting for my fourth to be sent through the post. The first one I spotted just when browsing the web, at first I thought it was dust and tried to remove it under my screen protector. After I did research I found out it was a dead pixel I booked a genius bar appointment, by then another dead pixel appeared. The second iPhone I got I spotted a dead pixel a week after getting it replaced, again I wasn't even looking for it and I spotted it on white backgrounds. I received my second replacement yesterday and decided to put on my screen protector before I set it all up. Then suddenly 2 appeared on the 'hello' screen and later on after reporting it I got 3 more. So thats 5 altogether on my second replacement. I'm not too sure if its just majority of iPhone 6's that are getting this defect or if I'm just super unlucky. Hopefully my fourth one will be fine, even if 1 creeps up I'm going to leave it, too much hassle now.