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Dog-faced pony soldier
Join Date: Feb 2004
Location: A Rock Surrounded by a Whole lot of Water
Posts: 34,187
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Lots of off-the-shelf alarms have a GSM add-on that you can use just in case someone cuts a phone line. That way your call still goes out (either to a monitoring company or a pre-selected other number, depending on the system). I have it on mine.
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A car, a 911, a motorbike and a few surfboards
Black Cars Matter
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