Existing Customers
Hours: 24/7
From billing questions to tech support, ADT customer service and support are ready to help you with your current ADT-monitored home security system.
Get Help
What is the customer service number for ADT?
When you call the ADT customer service and support team, you're on the line with those who put you and your safety first. If you're an existing customer, ADT customer service will answer any security questions you may have. Need help with your system? Contact tech support and ADT will troubleshoot with you over the phone to ensure your security system is running smoothly in no time.
Existing Customers
ADT customer service FAQ
What is ADT's customer service number?
You can call ADT customer service if you’re an existing or new customer. If you’re an existing customer, call 1-800-521-1734. If you’re a new customer ready to order, call 1-800-637-2220.
Is ADT customer service 24/7?
ADT customer service is 24/7 if you're an existing customer. If you want to become a new customer, our hours are 7am to 10pm CT.
My power went out. What do I do?
If your power goes out, your backup battery will kick in automatically to keep your system running without interruptions. It may beep at intervals to alert you the power source has changed. Clear the alert by entering your passcode.
When the power comes back on, your backup battery will recharge automatically. Call 1-800-521-1734 if you have any concerns about your backup battery.
I’m moving. Can I take my security system with me?
Yes, and you may even qualify for mover discounts! Please call 1-800-521-1734 for help transferring your service and equipment to a new address.
Where can I find my online account?
You can find your online account at MyADT.com. Log in to change payment details, schedule service appointments, and view your home security package details.
If you are locked out of your online account or need help setting one up, call 1-800-521-1734.
Can SafeStreets get me a discount on my homeowners insurance?
Usually. If your insurance company offers lower rates for monitored home security, you must submit your Alarm Monitoring Certificate to get the discount. You'll find the certificate in the Documents section of MyADT.com.
What are ADT’s customer service hours?
ADT's customer service agents are burning the midnight oil and ready to take your call. Contact ADT 24/7 for customer support at 1-800-521-1734.