on my last flight (this past september) i was on a 747....we had already pushed back from the gate when i noticed the woman across the aisle from me was using one of those fancy phone/PDA things....she was busy punching away on it, after they'd already made the announcement that all phones and electronic devices must be turned off..
so i turned to her and said, "that's supposed to be turned off"...
so she said, "i've turned off the phone part of it, but the rest of it can't be turned off....it can never be turned off or else i'll lose everything...."....
i was sure she must be wrong, but since i don't have a device like that, i didn't argue with her...but it didn't make sense to me since they say ALL electronic devices must be turned off....
but i don't know the answer....and since we were already close to takeoff, the flights attendants were already sitting down (at the back of our section --747 upstairs - we were in the front row)...had the flight attendants been wandering around, i might have asked them...
since we didn't crash on takeoff i figured it was ok...anyway, as someone noted, i figured there must always be some of these devices accidentally left on....