Customer FAQs Discover answers to the most frequently asked questions from ADT customers. 1. How do I test my alarm? To ensure your system is sending signals to ADT, we recommend testing it every 30 days. It’s easy to test your system, simply log into MyADT.com, select the My Alarm tab, select Systems Management from the left hand menu, and then click on Test System. You can also call 800-ADT-ASAP to put your system into Test Mode. Watch this video to learn how testing your system regularly helps avoid false alarms.