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You don’t need their code to set it and you wouldn’t want to. Always set your own private code. Scroll through the menu and find the code set up. Punch in your own and save it. It’s usually four digits. And you can always call an ADT office to have someone walk you through your settings and get you a manual for the system.
Source: how to reset the access code on an ADT home alarm system ...
This home security alarm system uses cellular technology. A burglar cannot defeat this alarm system by cutting the phone line outside the home ...