Re: Not just radio signal safety
The announcement at the airline where I work asks people to turn their phones completely off from when the doors close until the plane is in the air. This is so that people pay attention to the potentially life saving information of the safety announcement and in case of an emergency during one of the critical stages of flight. Many people don't listen to any of the announcements, as evidenced by the same questions being asked again and again but if they could just stop playing Angry Birds and typing just one more text then it may save their life in case of a fire or an emergency evacuation of some kind.
I put it to one of the pilots recently that it wasn't a big deal and he replied that they get lots of ghost readings and some could well be attributed to phones and as he is the one flying the thing I was not going to call bull shit. Can people really not go 10 minutes or so without playing with their phones?
Some people just don't like to be told what to do ever. They know best and they are the customer so therefore they can do what they like. Until the plane returns to the stand and they are escorted off by the police. Suddenly everyone else decides that it wasn't such an important game of Candy Crush after all.