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The airline rules are simply bordering on caution. The electrical systems of modern airliners are very well shielded. It would be absolutely idiotic if they were not. Imagine all the interference as they are coming in for a landing!
The odds of any electronic device you may be operating during the flight affecting any of the electrical systems are as close to zero as it's possible to get at the present. However, it's impossible to actually test the systems reactions to every electronic device on the market. Without being able to do that, you can't categorically say it's 100 percent immune to every stray electromagnetic fields a device may emit. Someone may have inadvertently designed a circuit in their new device that just so happens to cause extreme disruption to the planes navigation system. So, on the side of caution, you are told to turn them off.
Better safe than sorry I say...
The answers here of the "just don't get caught" sort disturb me greatly... So you're saying it's OK to potentially jeopardize your life as well as everyone on the plane as long as the crew isn't aware you're doing it?? Baffling...
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