HEY! I googled police stingray and that's what I got.............
http://en.wikipedia.org/wiki/Stingray_phone_tracker
The StingRay is an IMSI-catcher with both passive (digital analyzer) and active (cell site simulator) capabilities. When operating in active mode, the device mimics a wireless carrier cell tower in order to force all nearby mobile phones and other cellular data devices to connect to it.[SUP]
[3][/SUP][SUP]
[4][/SUP][SUP]
[5][/SUP] In active mode, the StingRay is capable of performing multiple operations upon a cellular device: (1) extracting stored data such as
International Mobile Subscriber Identity ("IMSI") numbers and
Electronic Serial Number ("ESN"),[SUP]
[6][/SUP] (2) writing cellular protocol metadata to internal storage, (3) forcing an increase in signal transmission power,[SUP]
[7][/SUP] (4) forcing an abundance of radio signals to be transmitted, (5) tracking and locating the cellular device user,[SUP]
[3][/SUP] (6) conducting a denial of service attack, and (7) encryption key extraction and interception of communications content.[SUP]
[8][/SUP] The StingRay's passive mode operations include (1) conducting base station surveys, which is the process of using over-the-air signals to identify legitimate cell sites and precisely map their coverage areas, and (2)
radio jamming for either general denial of service purposes[SUP]
[9][/SUP] or to aid in active mode
protocol rollback attacks. The StingRay family of devices can be mounted in vehicles,[SUP]
[4][/SUP] on airplanes, helicopters and
unmanned aerial vehicles,[SUP]
[10][/SUP] as well as carried by hand.[SUP]
[11][/SUP]