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I assume that most people here are familiar with the chirping noise that a mobile phone can induce in other audio equipment (cheap PC speakers for instance) if it is close to the cables...
Well, I have heard from a friend of a friend, who works in air traffic approach, that all day at work, when the pilots switch to the approach frequency, they turn on their mobile phones, causing the "chirping" to be transmited down the air traffic radio as they connect to the new cell network. If the pilots are willing to do this when the aircraft is a low altitude, coming in to land, with the phone in the cockpit, then I would suggest that our phones back in cattle class are not going to be a problem.
On the "readers on planes" subject, my wife and I went off on holiday last month, she with her iLiad, me with my Nokia E65, both for reading on the plane. We had a delayed departure so sat at the gate for 25 mins, but the cabin crew decided to get the electronics-must-be-off check done early. My phone (in flight mode) was picked up instantly due to the backlight, but the iLiad was completely passed over. I have to admit that I tucked my phone under my leg until the check was done, then pulled it out, carried on reading, and turned it off when we actually started moving.
And there were no problems with security, but the we were travelling in Europe, not the US.
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