providing, by a security system gateway and to a mobile device, interface control features for controlling a security system that includes the security system gateway, wherein the mobile device is configured to output and receive user input for the interface control features using one or more applications downloaded and configured to be run by the mobile device;

receiving, at the security system gateway and from the mobile device, control instructions through the interface control features;

controlling, by the security system gateway, one or more aspects of the security system based on the control instructions;

receiving, from the mobile device and by the security system gateway, mobile device sensor information associated with sensor data captured by the one or more applications downloaded on the mobile device at a premises monitored by the security system gateway, wherein the mobile device is configured to operate in a dual sensor-interface mode in which the mobile device simultaneously acts as a sensor and a controller for the security system;

identifying, based on the received sensor information, a mobile device sensor information rule;

identifying an action to perform in the mobile device sensor information rule; and

automatically performing the identified action, by the security system gateway, in response to receiving the sensor information from the mobile device.