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From ehat's been written the issue is two fold..
1) The phone mast distribution is designed and built to deal with vehicle based phones.. so spacing and speed of hand over from one cell to another is tailored for those speeds.
Going up and faster means that the phone can in theory be equidistant to tow or more masts (cells ) at a time hence using up more capacity than a gorund level reciever....thus whilst you are only making one call the network has to deal with it as two or three or whatever, hence they are losing money....
2) Mutual interference between phones and aircraft systems. You're right that planes are bombarded with all sorts of RF emissions and all sorts of combinations during testing and certification. However they cannot test every possible combo and possibility. So rather than take a risk that a 1 in 10 million combo may detract from a system a blanket ban is applied.
The use of cell phones (and internet) is being made possible by installing a cell on the plane that then uses a sat link to a ground station to link all the calls and internet demands.....that way the transmission is 'controlled' in that it goes from phone to aircraft mounted mast (ignoring all others) and from there via a tested sat link (nice money spinner there) to the gorund...
Learnt all this whilst getting a sat phone installed on the jet....
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