Triggerfish describes a technology of cell phone interception and surveillance using a mobile cellular base station (microcell or picocell).
The devices are also known as cell-site simulators or digital analyzers.
Neither the user nor the cell phone provider need to know about Triggerfish for it to be used successfully.
[3] The device is similar to but distinct from an IMSI catcher.
[4] On March 28, 2013, the Washington Post reported that federal investigators "routinely" use the systems to track criminal suspects, but sometimes fail to explain the technology sufficiently to magistrate judges from whom they seek search warrants.