Hey guys. Wondering if any of you know why my iphone 5c screen has just turned itself grey whilst in the middle of me writing a txt. The screen went grey with the word 'amateur' written in the middle of the screen. And nothing else apart from a dismiss button at the bottom. I pressed the dismiss button and it all dissapeared. It was as if someone was calling me, but obviously wasnt that. Any help would be appreciated guys. Cheers.