And your cell phone can be activated to eavesdrop without your permission. I listened to a twenty-something cell phone company technician describe their favorite insider prank, jacking the system so a friend's cell phone activates in his pocket to allow eavesdropping. They prefer to do it when their pal is in some compromising circumstance so they can tease him later about what he said. No doubt more serious people also know how to turn your cell phone on without your knowledge. If your battery is in the phone, it might be listening and recording.