You board a plane. They tell you to turn off all electronic devices. Once in flight, they tell you that you may now turn on approved electronic devices. So how does using your phone in airplane mode fit into this? Do you turn it off when told, then turn it on when it's okay to and hurry and put it into airplane mode? Or do you put it into airplane mode, turn it off, turn it on, and it's still in airplane mode? Or is simply putting it into airplane mode when told to turn it off enough?