^^If I may ask, why? If the device is not transmitting or receiving in any way what reasons are there for wanting them switched off? Is it in case of an emergency so that people aren't distracted? In that situation I would imagine most normal people would drop whatever they are holding and get the heck out but you never know... Or are pilots of the big metal just self conscience that someone might film a less than perfect landing? :P
Mobile phones clearly pose no risk to general aviation, my flying instructor sometimes pairs his phone with headset via bluetooth if he is expecting an important call. Doesn't seem to create any noise or buzzing. Many headsets are marketed with the ability to be able to do bluetooth pairing, so it must not be a risk.
(No risk that is, provided you only use it when at cruise altitude when the workload has decreased and certainly not during takeoff, climb-out, descent, approach or landing!!)
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