Cell phone users, beware. The FBI can listen to everything you say, even when the cell phone is turned off.

A recent court ruling in a case against the Genovese crime family revealed that the FBI has the ability from a remote location to activate a cell phone and turn its microphone into a listening device that transmits to an FBI listening post, a method known as a “roving bug.” Experts say the only way to defeat it is to remove the cell phone battery.

“The FBI can access cell phones and modify them remotely without ever having to physically handle them,” James Atkinson, a counterintelligence security consultant, told ABC News. “Any recently manufactured cell phone has a built-in tracking device, which can allow eavesdroppers to pinpoint someone’s location to within just a few feet,” he added.

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