Ars has "the most comprehensive picture to date of the mobile phone surveillance technology that has been deployed in the US over the past decade."
Seems like most of these machines can identify the location from which a phone call is being made, collect hundreds of IMSIs and ESMs, view texts, and listen in on calls. They're in the hands of the usual three letter agencies but also lots of local police departments.
Apparently, "their use by law enforcement agencies is in a legal gray zone, particularly because interference with communications signals is supposed to be prohibited under the federal Communications Act."
So what do you guys think? Is any of this surprising? Any technical insight? Ever notice any strange behavior on your device which makes you think you might have been surveilled by one?