I've always thought that regardless of any real or perceived risk of mobile phones in flight, it would really piss you off listening to a hundred phones over the intercom "checking in" to their service when getting in range. I know it's annoying enough hearing 1 or 2 when you're trying to listen to your clearance.
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Howard hughes, the "correct and caught on film" quote refers to the fact that explosions are a fact and have been caught on film, not that they're caused by cell phones.