AFAIK, there is NO evidence, other than ancient anecdotal evidence, that any common electronic device, including cell phones, causes a problem of any kind on a commercial aircraft.

What is it most non-transmitting electronic devices could do that most any wristwatch couldn't? They both contain oscillators, supposedly the problem part. And even cell phones which are transmitting have never caused an accident that I have heard of.

Anyone got any evidence to the contrary?