Systems and methods of operating an alarm device of a home security system which integrates one or more sensors of a mobile device when the mobile device is located within a home protected by the home security system are provided. The security system may determine an unauthorized entry to the home based on an operating mode of the home security system and sensor data collected by the one or more sensors of the mobile device. An alarm may be output by the alarm device of the home security system based on the determined unauthorized entry by the home security system.