My 6+ has a yellow screen, as did my iPhone 5 before it. The iPhone 4 before that had a lovely white screen. With so many faults possible on these phones (loose buttons being the one I encounter most) it isn't worth the gamble of exchanging because the screen isn't perfect. Of course it should be for the premium paid but in reality most iPhone screens have a yellow tint to them so why swap a perfectly functioning phone to get one with another yellow screen, possibly a black splodge too, a clicky home button and loose volume buttons etc? I stuck with my first 6+. The buttons are fine, there are no scratches, the screen doesn't click and there are no hardware faults. The yellow screen, especially noticeable in sunlight, is a pain but 'they're all like that Sir'.