Personally I think more high-school/college tests should be given with the students using computers & the internet while taking them, since that's how the world works now. Not all tests by any means, but more than currently. But until that point, letting some students use their iphones because it's also their graphing calculator, on a test where most students don't have access to the internet and their friends and other test takers with iphones, is an invitation for cheating.