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Since electromagnetic fields fall off as an inverse square of distance this isn't really relevant from my economy seat to the cockpit, but cell phones can cause some significant interference. In meetings I can often tell when a cell phone is about to ring due to the sounds that start coming out of the conference room's speakerphone... I've also had the experience (many times) of putting my cell phone and electric shaver together in the center console in my car and having my shaver start spinning randomly in short bursts from the cell phone's transmissions.
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