Quote:
Originally Posted by Chris Roope
You lose reception about halfway up the climb and wouldn't get it back until descent at the other end, so I doubt thats the reason.
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That may be the case with conventional GSM but Telstra's NextG network, for example, claims to work up to 30 km off the coast, so at 10 km above the ground I don't think there will be a reception problem. There could be a cell registration issue if multiple cells are almost equidistant from the a/c, and that might interfere with network access/usage, for the reasons explained in the channel re-use section of the article that Mike has linked to (which is most informative).