[psychotik]

Run off? No. Have them peek at my email? Maybe. Have them see a notification popup? Maybe. Have them accidentally lock phone and try to unlock it with wrong code? Maybe. I hand a phone to someone, get distracted and lose track of them for a few minutes? Maybe.

[coderdude]

I suppose there isn't much you could do about that, aside from getting distracted, but that's stressful having to worry about it every time you hand your phone off to get a new contact. As another commenter suggested though, people do this already when getting people to enter in their own details. All in all, I think the idea of having to hand your phone off sucks regardless of possible privacy or theft issues.