Just because you ebook reader does not have 3g or WiFi does not mean its not radiating electronic signatures. Depending on where it made, and to what quality, the emissions from your device could be interfering with the electronics of the aircraft. The problem stems from the fact there are so many of these devices and to test them all against every aircraft type would be financially prohibitive, especially as new devices are coming out all the time.
The sensible thing to do is to ask people to turn them off during the most crucial phases of flight.
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