Several phones left on would be a big safety issue as there would be , say 8 signals going off , for only 4 phones , 200 if all passengers left phones on !Try at home putting as many phones at hand near a radio & listen for the result.Most of the airband signals from /to the plane are related [harmonics] to cell phone frequencies. Probably near 200 watts ,total power if all passengers used their phones within 10 meters of the avionics.Must have some issues.
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