Can I switch from phone line to cell monitoring on the Concord 4?

Yes, you can switch, 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.
Start your cellular comm test by Pressing 8 + Installer Code (default 4321) + 3, then disarm the system immediately, This procedure will initiate the comm test on your Concord 4.

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