Court documents in a case involving accused identity thief Daniel David Rigmaiden describe how the wireless provider reached out remotely to reprogram an air card the suspect was using in order to make it communicate with the government’s surveillance tool so that he could be located."
http://www.wired.com/threatlevel/2013/04/verizon-rigmaiden-aircard/
Cell phones and related equipment such as air cards can certainly be used to keep the government in touch.
