Hi all I've searched the forum and there were only a couple of threads for the 5S about this issue with few posts. I received my replacement unit today (brand new, week 47, F2) and it had the same problem as my previous device, a yellow tint. It's really bugging me and the screen is noticeably yellow compared to my MBP and my friends who own an iPhone 5. Is this issue on every iPhone 5s? If it's normal for all iPhones 5s devices then I guess I'll have to live with it. I don't want to waste time returning the device again and end up with the same problem. Does anyone of you have good screens with perfect white colors?