Due to the fact the voice is send in burst, the processing done in the phone, and the processing done at the switch level (echo cancelling, ...) there's a lag around 300ms I guess.
It would be more expensive than the current transmitters, as you would need 2 phones (with one in an embeeded configuration), plus the interface to the servos. You would also have to pay the communication.
There's also another problem: the network is not designed to cover the sky.
Antennas are always tilted in the direction of the ground, to avoid troubles of interferences between different cells, and what we call resurgences (when a cell covers an area it shouldn't). So you'll loose quite quickly the reception.
The higher you go, the higher the number of cells you'll also receive, but as we reuse the same frequencies on different cells, you'll have more and more interferences, and loose the communication.
So all in all, it's not a very good idea.
@++
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