" Hellfire missiles, the explosives fired from drones, are not always fired at people. In fact most drone strikes are aimed at phones. The SIM card provides a person’s location; when turned on, a phone can become a deadly proxy for the individual being hunted. When a night raid or drone strike successfully neutralizes a target’s phone, operators call that a “touchdown. "

― Jeremy Scahill , The Assassination Complex: Inside the Government's Secret Drone Warfare Program