Iv sat on the flightdeck while taxiing once and overheard that familiar mobile interference (which you hear if a mobile is receiving a signal next to a radio or Computer) come through the earpieces in the flightdeck
A well known carrier flying into NI is often heard to have a "mobile" dit dit ditting in the background when they respond to my instructions on the RT.
Secondly (and no defence for disobeying a direct instruction) could the chaps phone been in "Flight Safe" mode?
Final input here. A pal of mine who is a captain for a very well known British airline once told me of HIS phone ringing just as they got airborne abroad...no sin? cast the first stone!
