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How do I install the GSM4G Cellular Communicator on the Vista 21iP?

Last Updated: 11/06/2013
The GSM4G is built specifically to snap right onto the Vista 21iP Control Panel.

Doing so creates a dual-path system.  Since the Vista 21iP already has a 7847i built into the panel, your system will be outfitted with both an internet and cellular communicator.

Why install a GSM4G...

Even though your Vista 21iP already comes with a 7847i, internet communicators are not as reliable as cellular communicators.  Turning your panel into a dual-path system creates a safer environment for your home or place of business.

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