Barkly,
My understanding is that the ICAO reluctance is not any technical grounds of problems relating to EMC, but the very real ones of some twerp busy telling everyone "I'm on the 'plane" or whatever for two hours getting the 'phone stuffed somewhere - or being punched.
It often seems to me that there's enough annoying b******* flying as SLF (I'm not one, of course!) without adding to their number.