Yes, you can switch your GE Interlogix Concord 4 hybrid security system from the phone line to cellular communications. The Access Code Lock (field 0003) in installer programming must be turned off in order for this to work.

A Cellular Comm test will also need to be performed prior to trying to send alarm signals, After connecting your Cellular module (600-1053-3-ZWAVE-AT / 600-1053-4-ZX-VZ
to your Concord 4 Alarm Panel and registration has been completed with your monitoring provider.

Follow these steps to run a cellular comm test on an GE Interlogix Concord 4 system.
Press 8 + Installer Code (default 4321) + 2. Then disarm the system immediately. This procedure will initiate the comm test on your GE Interlogix Concord 4 panel.

GE Interlogix Concord 4 - Alarm Monitoring Options

GE Interlogix Concord 4 - Frequently Asked Question's