hello. anyone else noticed a rattle when you tap the rear of the phone? tap the apple sign and as you get closer to the camera the rattle gets louder. sounds like a screw is loose and rattling around. I spoke to apple about this and they have replaced the phone but the brand new one they replaced it with rattles as well! I tried it on my friends and hers does it as well. Anyone else noticed this or is it just us two?!