When you fly, you're ordered to turn off all electronic devices during take-off and landing. There seems to be a lot of debate going on as to whether there's any good reason for this. Those who say there is don't seem to be able to say what that reason might be…or at least, they don't want to take the responsibility for lifting that rule and then there's some big air crash that gets blamed on a passenger using his iPhone to play Angry Birds.
I have the feeling we're not only about to see the end of that rule but the introduction (if it hasn't been tried already) of airlines competing by advertising they offer the best Wi-Fi signal throughout your flight. And maybe free loaner Kindles (or some other such device) in First Class.