[Osiris]

I turn off my cell phone simply to save the battery power. You don't get any signal above a few thousand feet, so why not save on battery for the next few hours? Heck, sometimes I even use my laptop's USB to charge the phone in-flight so it's full when I land.

I think the dumbest thing is having to turn off a Kindle. Is that even possible? Pushing the power button just goes to screensaver which uses exactly as much power as when you're actually using it.

[lucasjung]

>I think the dumbest thing is having to turn off a Kindle. Is that even possible? Pushing the power button just goes to screensaver which uses exactly as much power as when you're actually using it.

You can turn a kindle off by holding the power switch for a few seconds. I do this every time I fly, for both takeoff and landing (I leave the wireless off for the entire flight). Given how low-power a kindle is, I find it highly unlikely that it could cause interference (unless you leave the wireless on, which could definitely cause interference), but I've seen enough surprising results from Electromagnetic Compatibility (EMC) Safety of Flight Tests (SOFT) to know that you just can't make assumptions about stuff like that.