Do Electronic Devices Really Need to Be Turned Off During Takeoff and Landing?

via lifehacker.com

Dear Lifehacker,
When you fly on an airplane, FAA regulations require you to turn off and stow portable electronics, but is this really necessary? Sometimes I leave my phone on during take off on purpose by accident and nothing ever happens. Is this rule B.S. or is there really something to it?
Sincerely,
Flummoxed Flier

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