Thank you!
Now I can tell that stupid stewardess to STFU when she insists that "all mobile phones *must* be switched off *throughout* the flight, *even* if they have Flight-Mode."
Stupid cnut.
Wasn't the original reason for no mobiles on planes because when 400 mobiles simultaneously try to log into a cell tower, with a weak signal, travelling at speed, there tends to be a trail of knocked-out towers under the flightpath of a 747?
