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Official ADT Customer Support
1-800-238-2727 New customers, monitoring & emergency support
schedule 24/7 Support Available — Available 24/7
verifiedVerified Official blockNo Hidden Fees access_time_filled24/7 Support
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Business / Alternate Line
1-800-521-1734 Existing customer service & billing
Support available via: PhoneLive Chat24/7 MonitoringProfessional Installation
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About ADT Inc.
ADT Inc. was founded in 1874 and is headquartered in Boca Raton, FL. ADT is the largest professional security monitoring company in North America with more than 6 million customers. ADT offers professionally installed alarm systems, 24/7 monitoring centers across the USA, smart home security packages, and the ADT+ platform with Google Nest integration. ADT is the only major security company with 24/7 professional monitoring for every customer.
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When to Call ADT Support
These situations typically require speaking with a ADT representative directly.
- check_circle Your ADT alarm is sounding and you need it silenced or to contact your monitoring center
- check_circle You want to add sensors, cameras, or smart home devices to your ADT system
- check_circle You're moving and need to transfer, cancel, or pause your ADT service
- check_circle Your ADT control panel shows a system fault, low battery, or communication error
security ADT Products & Devices Covered
This support number handles service and technical support for the following ADT products.
security ADT Command smart panel
security ADT Command motion sensors
security ADT door & window sensors
security ADT indoor & outdoor cameras
security ADT Google Nest thermostat
security ADT smart doorbell
security ADT Carbon Monoxide detector
security ADT smoke & fire detectors
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Common ADT Issues
The most-reported ADT problems and what to expect when you call for each.
alarm
Alarm sounding / false alarm
ADT alarm is triggered and you need to cancel or silence it
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Panel shows system fault
ADT control panel displays fault, trouble, or check zone message
chevron_right battery_alert
Sensor offline or low battery
A door, window, or motion sensor shows offline or low battery
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Can't access ADT+ app
ADT+ app not logging in or devices not showing in the app
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Monitoring center not responding
Alarm triggered but no call received from ADT monitoring center
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Fix It Yourself
Try these steps before calling. They resolve the majority of common ADT issues.
1
Keep your duress code and password current
Your ADT verbal password is used to cancel false alarms over the phone. Your duress code silently alerts monitoring during a coerced disarm. Update both annually by calling 1-800-238-2727 or through the ADT+ app.
2
Test your system monthly from the keypad
Put your ADT system in test mode (Menu → Test, or call ADT to place it in test mode), then trigger each sensor. This confirms all sensors are communicating with the control panel and the monitoring center is receiving signals.
3
Update your contact list with ADT
ADT calls your contact list in order when an alarm triggers. Make sure your contacts are current, reachable, and know your verbal password. Call 1-800-521-1734 to update your emergency contact list any time.
shield Warranty & Coverage
ADT professionally installed equipment includes a 6-month warranty on parts and labor. ADT+ smart devices include the manufacturer's standard 1-year warranty. Extended service plans are available through ADT monthly service contracts.
quiz ADT FAQ
Common questions answered by our research team.
add Can I cancel my ADT contract early?
ADT contracts are typically 2-3 years. Early termination fees are usually 75% of the remaining monitoring fees. In some states, cooling-off laws allow cancellation within 3 days. Contact ADT at 1-800-521-1734 to discuss your cancellation options.
add Does ADT work without a phone line?
Yes, all ADT systems can communicate via cellular (included in monitoring plans) so you don't need a landline. ADT recommends cellular-only or cellular + broadband dual-path monitoring for maximum reliability.
add How much does ADT cost per month?
ADT monitoring plans range from approximately $28.99/month (Essential) to $60.99/month (ADT Command + Smart Home). Equipment costs vary. Self-install options (ADT Blue) start lower than professionally installed systems.
add Does ADT install their own equipment or use third-party devices?
ADT uses proprietary ADT-branded sensors and control panels for most installations. ADT+ integrates Google Nest cameras and thermostats. ADT does not typically support third-party security hardware on their monitoring platform.
add What happens when my ADT alarm goes off?
ADT's monitoring center receives the signal and attempts to contact you using your verbal password. If they can't reach you or receive your password, they dispatch police, fire, or EMS based on the alarm type. Average response contact time is under 1 minute.
business_center ADT Business Support
ADT Commercial provides business security monitoring, access control, and video surveillance with dedicated commercial account management. Request commercial services when calling.
phone
Business Line: 1-800-238-2727