Hi all - I have a very strange scratch(?) on my iPhone. It's just above and to the right of the earpiece. It looks like the sort of line you could draw with an etch-a-sketch! It's only developed in the past week or so. The surface of the glass isn't scratched at all - running my fingernail over it is smooth and flawless, so it must be under the glass - but how?! I haven't dropped my iPhone recently, nor has it been in a pocket containing keys or any other items. I've attached a photo of it, so I'd really appreciate to hear what you all think it could be! Also, do you reckon it's grounds for a replacement from O2?