I have in the past, before the ban on mobiles in flight, used my phone to say goodbye to my girlfriend in climb after cleanup in the Classic 747. At no time did I observe any detrimental affects to flight instrumentation. Maybe its different in glass cockpits, I now comply with the rules as a pax but can not understand why one must not use mobiles untill disembarkation after engine shutdown? Far more powerful transmitters are being used every day by groundstaff which in fact used to run outflow valves shut in the classic. I was severly admonished once by a cabin purser for using my mobile after shutdown, waiting to disembark at the gate. His excuse was that refuelling had commenced and using my mobile presented an explosion hazard. What a load of c#ap. Little did he know that at the same time there were about three walkie talkies of ground personnel in full blast.
