Call Support

Whether you’re looking to set up an installation appointment, are trying to change your appointment time, or have questions on your brand-new ADT-monitored security system, we’re here to help. Simply give us a call at (301) 278-8866. Our business hours are Mon-Thu, 9:00 AM - 7:00 PM and Saturday & Sunday 9:00 AM - 5:00 PM.

You can also browse through our security FAQs to find answers to our most common questions.