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http://motherboard.vice.com/read/edmonton-police-a...

«Stingray devices range in price from tens of thousands of
dollars to over one hundred thousand dollars.
Also known as IMSI catchers, they force any phones within a
target radius to connect to the device and transmit
identifying information. When a phone is caught by a Stingray,
the police obtain the phone and SIM card IDs, as well as its
location and service carrier. More recent Stingray devices are
capable of intercepting voice and text communications.
Stingrays surveil phones indiscriminately, leading some
commentators to label them as "mass surveillance" devices.»