How the NSA can 'turn on' your phone remotely

(CNNMoney) Even if you power off your cell phone, the U.S. government can turn it back on.

That's what ex-spy Edward Snowden revealed in last week's interview with NBC's Brian Williams. It sounds like sorcery. Can someone truly bring your phone back to life without touching it?

No. But government spies can get your phone to play dead.

It's a crafty hack. You press the button. The device buzzes. You see the usual power-off animation. The screen goes black. But it'll secretly stay on -- microphone listening and camera recording.

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