BEWARE! I switched from ADT to another monitoring company.
When he came to install the new system we saw a red light blinking on the ADT box. When we opened the cover the SIM card had fallen out meaning ADT couldn't receive a signal from my home. When I called ADT the last active signal they received was 6 months prior! This means they weren't monitoring my house, yet I had paid them for 6 months!
They said for all they know I tripped the system and without an ADT person taking a look at it there was nothing they could do. I asked them to provide proof the system was being monitored, and they couldn't.
So much for being a good customer for 4 years! Customer service is TERRIBLE!
Reason of review: Damaged or defective.
ADT Cons: Customer service.