This has been discussed over and over.
It remains my firm belief that if the authorities believed that there was any real risk they would not allow these devices on an aircraft at all. The chance that there is no device turned on either purposefully or accidentally on any given take off or landing is negligible. Given the number of aircraft taking off and landing every day common sense tells me there is no risk. This has been real world tested thousands of times. I am quite sure that every flight has dozens of devices that remain on despite the rules.
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