I should explain that I haven't even tried using it on a commercial flight. I have used it in light aircraft (to take photos etc) when I am flying. Not that I think that a 30 year old C206 has enough electric gadetry to be affected by the phone signals! However, as I am currently flying very close to an international border, the phone has a tendancy to lock on to the foriegn network, which can be expensive if the phone is then used! Doesn't 3G require sending as well as recieving of signals as well though?