Contact ADT Service Cancellation

Find the details for contacting the ADT Service Cancellation department. You will notice multiple methods for contacting ADT Service Cancellation including the phone number, steps to reach a human, the department's hours of operation and more.

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Service Cancellation

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Phone: 800-662-5378

  • How to reach a live person:
    • Press 6
  • Hours of Operation:
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  • Email:
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  • Customer service link:
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  • Description:
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