How can i cancel my adt service? Here are the steps on how to cancel your ADT contract: Visit the ADT website and scroll to the very bottom of the home page and click on Help Center. In the search bar, type in “How do I cancel my service?”. Scroll down and click on “Account and Billing FAQs”.Why does adt have six monitoring centers? Why Does ADT Monitoring Have Six Monitoring Centers? ADT monitoring has six interconnected monitoring centers because your security matters. By providing multiple centers stationed strategically throughout the United States ADT monitoring can ensure some of the fastest response times.Where is adt corporate headquarters? ADT Inc., formerly The ADT Corporation, is an American company that provides residential and small business electronic security, fire protection, and other related alarm monitoring services in 35 countries. The corporate head office is located in Boca Raton, Florida.