I'm sorry but I don't quite get that. I understand the phone in a pocket can be woken up by an accidental double tap (hard, but possible), but how on earth is an accidental rub of the phone against your leg (most of the time through some cloth) going to produce a swipe? When you take the phone out of the pocket to answer? Great, you won't have to do anything then, just put it in your ear! ;-)