Mobile tracking is a key challenge that has been investigated from both practical and theoretical aspects. This mobile phone security system allows us to determine the position of mobile devices. The scenario proposed in this paper is using hardware. The scheme provides a viable solution of restrict theft activities. If theft has occurred, it will work in such a way that, when SIM interchanged or mobile is restarted, a password will be sent to the alternate number. The password which the alternate number gets should enter in the developed application. Through the application the device can be locked, find the location of the lost device and beep sound can be turned ON in the lost mobile device.