This document describes a proposed system called a "sniffer" to track lost mobile phones. The sniffer would act as a base station using sniffer technology. It would include a sniffer base station to maintain frequency, a unidirectional antenna to transmit and receive signals at the desired frequency, and tracking software. The tracking software would input the IMEI number of the lost phone from its RAM and check for response signals from the phone. If a response signal is received, the location of the lost phone could be determined. The document discusses the design of the sniffer base station, antenna, and software to implement this tracking system using the phone's unique IMEI number.