Greg - Alterations to the aircraft are indeed made for these sort of things, and in some cases the aircraft are required to undergo interference testing prior to use.
Besides which, it will be permitted but NOT during takeoff and landing.
ILS (and GPS for that matter) signals are very sensitive. Do some research about interference, and you'll see why the CONSERVATIVE option is taken. You have absolutely NO need to use a phone or electronic device during takeoff and landing, and so the industry is not prepared to spend the enormous amounts of money required to prove that it is (or isnt) safe.
Jake
Yes the reaction would have been different because he would not have been breaking the instructions.
Also, the reason why has been made clear - interference. It is difficult to positively prove that no interference will occur during takeoff or landing, and so it is banned. If you would like to prove to the airlines it is safe I'm sure they'll listen - but I hope you have deep, deep pockets to do the necessary research.
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