Mobile device as a security system component

A method for using a mobile computing device as a component of a security system, the method comprising:

• receiving, at a security system gateway of the security system and from the mobile device, control instructions for controlling the security system;
• 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 mobile device at a premises monitored by the security system, wherein the mobile device is configured to additionally operate in a sensor mode for the security system;
• and
• in response to receiving the sensor information from the mobile device:
• identifying, based on the received sensor information, a mobile device sensor information rule;
• identifying an action that corresponds to the mobile device sensor information rule;
• and
• performing the identified action, by the security system gateway.