This document describes how a sniffer device can be used to detect and locate a lost mobile phone. A sniffer is a transceiver that operates at unused frequencies to detect signaling information from lost devices. The sniffer software takes in a lost phone's IMEI number and checks for signals. It works in two phases: first, the sniffer increases its frequency to connect solely to the target phone before locating it. The software then displays details like the MAC address and packet data to identify the lost phone's location. The goal is to develop an effective technique for recovering lost mobile phones using sniffing technology.