600-1048-XT-ZX-AT - GE Interlogix Simon XT/XTi Cellular AT&T 3G Alarm Communicator (Powered by Alarm.com)
Please Note: The Alarm.com 600-1048-XT-ZX-AT GE Interlogix Simon XT/XTi cellular 3G GSM communicator (for the AT&T Network) has been discontinued and replaced by the 600-1048-XT-LTE-AT model number.