I had a mobile phone against a dash board in the car once, and all the dials went crazy and started flicking like mad. Therefore, I'm not particuarly keen on seeing phones being used on aircraft. However, when flying to Tunisia earlier this year with Thomas Cook
"Please ensure all mobile phones are turned off, the use of air mode is prohibited..."
If air mode is meant to stop the phone sending out signals, what's the point in not allowing passengers to use it?