New Service on Concord and 3G

Bought new home and previous owners had concord system with 3G. There are 2 panels installed. What do I need to start monitoring service. Do I need to upgrade to 4G before starting new service. System works fine want yo start monitoring and

Steps to get started with a Concord 4 are found below.

A 4G LTE module is needed. 3G services were sunset by carriers. These might be harder to find now due to the fact that the manufacturer Interlogix shut down their security products sales a few years ago. Alternative panel suggestions are in the guide above. Installation steps for the Concord 4G module are below: