I haven't taken the bumper off my phone from when I got it (24 June) except for yesterday and noticed there are black little scratches in the metal part of the phone. I've tried wiping these off but have noticed that they're actually indented in to the phone (I originally thought it was dirt). I always keep my phone in a case and there is no way the case could have gotten dirty inside. If I call up Apple, will they replace the phone? And if they can, can I get a replacement 32GB instead (obviously paying extra)? Thanks.