Racedo
One of the one sancturies that anybody flying as a passenger has is that no muppet on his phone shouting "I am on way to Torremolinos with Bev for weekend"..............soon to be a thing of the past
Ryanair are only permitting phones in flight mode, so we should be saved from the muppets!-))
I suspect though, that confusion will rule and people will "forget" to select flight mode. The danger there, is 200 odd mobiles all trying to find a signal at once! That's a lot of electrical disturbance going on!
Modern aircraft rely on undisturbed electrical signals to connect the pilot to the controls. Is it really worth taking a chance just so someone can play a game?