Flight mode

Is a feature that allows you to use the phone with no SIM card.

or rather deactivates the sim card even with it in the phone thus enabling you to use the phones other functions somewhere where normally phones are not allowed due to signal interferance i.e a plane hence flight mode.

There is no Interference at all in flight mode ? (I don't want to crash during my next flight ! 😊 )

no. I don't know if it deactivates the radio though. I know the 7650 doesn't have one but the n-gage does. Can radio waves interfere in hospitals and on planes?

I am not sure about planes, but with hospitals, there shouldn�t be any problem, since radiowaves are everythere anywhere...
(although, you might find yourself to be told to switch your phone off in the hospital, while just listening to radio... *g*)

BTW: How do you activate the flightmode on a 3650?

(Sorry for bad english...)