PASTED FROM A PM BY A NOKIA ENGINEER WHO WISHES TO REMAIN ANOYMONOUS; THANK YOU! JC
Flight mode
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Hi - an answer to your question about Nokia devices in flight mode -
When you enable flight mode, all external RF-transmitting systems will be disabled. This includes cellular voice & data (2G & 3G), bluetooth & WLAN. The reason for the "3G" icon remaining is more of a software glitch taking a while to be removed. As soon as you switch to flight mode and the bar strength indicator becomes disabled then all transmitters are disabled.
In order to gain worldwide type certification your handset would have been tested rigorously by independent countries authorities to ensure compliance so you can be pretty sure your phone isn't transmitting anything in flight mode.