Apologies if its been said already - i speed read the posts above.
As I understand it cellphones are only one half of the equation - the other being the network - cellphone towers.
Shouldn't we be falling out of the sky every time we fly past one? (I'm assuming that cellphone towers are more powerful and transmitting on hundreds more frequencies simultaneously?)
I've flown/hovered around loads of them and never had any problems - apart from a slight warming of the gonads...