Methods, systems, and apparatus, including computer programs encoded on a storage device, are disclosed. A system performs operations including receiving sensor data from a sensor of a property monitored by a monitoring system, and based on the sensor data, determining a first event and a second event that have occurred at the property. The operations include determining that the monitoring system is not able to communicate with an outside network, and classifying the first event as a high priority event and the second event as a low priority event. The operations include determining that a mobile device is able to receive data from the monitoring system; and providing, to the mobile device, data indicating the first event and an instruction to transmit the data indicating the first event to a server upon the mobile device being able to communicate with the outside network.