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Originally Posted by EowynCarter
There is something I don't get there. Either the device can disturb the plane's electronics, and it can do so anytime, either it can't.
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The more stringent restriction at takeoff and landing is simply because in cruising flight there is more time to react to any problems.
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The "everything off" exists for the reason ChrisC333 mentioned, to much of a mess to sort out wireless from non wireless. Not for real security reasons.
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*All* electronic devices radiate, to a greater or lesser extent, so the theoretical risk is not limited to wireless transmitting devices.
Passengers are generally not competent to judge whether or not the (admittedly probably miniscule) additional risk caused by not turning off the device is acceptable, so they should do what they are told.
/JB