triggerfish
n.— «A cell site simulator, digital analyzer, or a triggerfish can electronically force a cellular telephone to register its mobile identification number (“MIN,” i.e., telephone number) and electronic serial number (“ESN,” i.e., the number assigned by the manufacturer of the cellular telephone and programmed into the telephone) when the cellular telephone is turned on.» —by US Department of Justice Electronic Surveillance Manual Procedures and Case Law Forms June, 2005. (source: Double-Tongued Dictionary)