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The general public is not competent to judge whether or not their device will interfere, therefore it's a perfectly reasonable expectation that passeneger should just turn off their devices when asked to do so.
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With proper explanation, they can be. Most of time, they will know if their device have 3g, wi-fi, or bluetooth.
If they don't understand, they might let their phone on in their bags, not by malice, but because they don't understand why it can be a danger.
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*All* electronic devices radiate, to a greater or lesser extent, so the theoretical risk is not limited to wireless transmitting devices.
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True, but save for wireless stuff, i can't think of anything (in term of everyday use can-be-carried-in-a-plane stuff)