Every day thousands of mobiles are lost or lost, but an effective way to block lost mobiles to prevent an unauthorized person from making and receiving calls has been made by mobile manufacturers with the help of International Mobile Equipment Identifier IMEI) has been done, but however there has been no development or very little progress for mobile phone detection out of place. For SNIFFER mobile loss detection plays a vital role. The sniffer device has to be precisely designed and the size must be reduced to facilitate mobility for detection purposes. The device can be called as a mobile base station that includes Sniffer Base station, Unidirectional Antenna, tracking software. The sniffer is a small base station that includes the transceiver section. It must operate at a frequency that is very different from the frequency of the current cell in which the detection operation is being carried out. The directional antenna is an important device that will be designed and used as it plays an important role. There are certain boundary conditions that have to be qualified for the identification of lost mobiles as the power of the mobile should be good enough, the mobile phone should not be in the shadow region, but nevertheless this method using modern technologies and devices . Our role seems to be a little more expensive for initial setup, but the cost is gradually reduced when efficiently and efficiently used for the purpose of detection.