I am not home, How can I arm/disarm the system?

Alarm systems, Sensors and accessories, GSM connectivity, Security codes / Alarms, Controllers, Detectors, Sirens /

Depending on the model,first you should enable the phone remote control function ( S4 model).When you are out,call the phone number and input the command to remotely control the system.For other GSM - alarm systems,just send commands through SMS or App by smartphone.