Not in an external exam. I've never had to, tbh, although recently I'm feeling more and more like just peeking at the genius sat next to me who has already finished and is flipping through his paper feverishly... I also have a UV pen where it writes invisible and has a teeny UV light on the end that makes your writing show up, I think that's pretty tempting. I never will though, especially as I've only got three exams left and there'd be no point because I've already revised for them. Maybe I will for General Studies tomorrow. Oh wait no, because I'll get higher than the person sat next to me anyway. I don't mean that in a big headed way, I got 100% at AS. Anyway, I've always been so paranoid about exam regs and getting all my grades scratched that I tend to check my pockets at least five times for my phone/ipod before I go in.