ADT Inc., earlier known as The ADT Corporation, is a US based company that provides residential, small and large business electronic security, fire protection, and other related alarm monitoring services. Product categories offered by the company include Home Security, Smart Home Automation, Security Cameras, Business Security, Commercial, Health & Senior Safety, and Identity Theft Protection. ADT offers continuous assistance to address consumer grievances. In order to get in touch ADT with regard to relevant concerns and queries, customers may refer to given customer service number. ADT Customer Service Number: (800) 716-3640 |  1-800-521-1734 ADT Account Customer Service Number: (800) 914-0477 ADT Sales Customer Service Number: (800) 246-9320