Customer FAQs Discover answers to the most frequently asked questions from ADT customers with the click of a button. 1. When my system was installed, I wrote a check to ADT, but it's not reflected on my first bill in my account. Is there a problem? No. Sometimes, due to billing cycles, your first bill may be issued before payment has been posted. The payment should appear on your next bill. Once the payment has been posted, you will also be able to view your updated balance on MyADT.com by selecting the My Account tab.