Gentlemen, I am from Australia , and our governing body, MAAA, recommends that mobile phones should be kept well away from radio transmitters. It is interesting that a major radio manufacturer recommends that mobile phones should not be taken near transmitters as the signal from them, ie, the telephone, exceeds the design specification of their equipment.If your radio has been close to a mobile phone that was switched on, check very carefully that it functions correctly before takeoff. There are reliable reports of information in the memory of your radio being changed. This happened just last weekend to one of our fellow members, who on take off found all his controls were changed to 15degrees of down elevator and ailerons 10 degrees of right aileron. The result was a cartwheel down the runway.