The rules are just plain silly. Despite the requirements that cell phones and other devices be turned off I have personally witnessed the opposite on nearly every flight I've been on over the past year. IF there was any REAL risk associated with the use of these devices they wouldn't allow them on the plane. I can only assume that the airline's attitude is that the risks are sufficiently low enough that having x% of the passengers breaking them on each flight will not have any measurable deleterious effect.