Do you need a phone line for a home security system?

Just curious, we have a little office space, but are using cell phones - haven't hooked up a phone line. I want to get the "Mace Wireless Home Security System" from Walmart, but do I need a phone line for that to work? It dials numbers so I'm assuming it has to be connected to a phone line. Just... show more Just curious, we have a little office space, but are using cell phones - haven't hooked up a phone line. I want to get the "Mace Wireless Home Security System" from Walmart, but do I need a phone line for that to work? It dials numbers so I'm assuming it has to be connected to a phone line. Just wondering because I can't buy it from the store, so I need to know ahead of time if I'm in for making another bill for phone service.
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