Yep, simply jamming them unfortunately won't help, as all you're doing is making *more* signal in the same band as mobile phone.
I fully agree that the d*mn things MUST be turned off on the plane, in flight or on the ground.
Perhaps a wand (like the metal detector type) that is waved over you as you board the plane that detects if they're on or not. If it's on, then it's taken from you and crushed in a vise ...
Um, sorry, I meant taken off you and returned at the end of the trip.
Freudian slip ...
