I can see where maybe in the day it was a safety issue. When towers were few and far between around here, I used to put my phone on the dash to get a better signal. When the phone would ring, the radio would cut out, which worked as well as a ringer I guess. Certainly that may have been bad for a plane's navigational equipment. But those were old analog phones that were big enough to be used as weapons.
Something that makes me suspect the effect of modern phones is that I've seen a few hospitals drop cell phone usage rules. Even when my dad was in ICU recently the staff used cells.
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Don't always trust the opinions of experts.
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