Most of the DIY systems can dial out both ways or as E-flyer found other systems that do.
For a crook to cut your phone line is not just walking upto the side of your home and snipping a wire most are underground, so they need to go the the green utility box open that and cut then break in, takes them too much time.
Moreover, if there doing all that it is because they saw a sign that you have alarm protection.
I think it's easier to go to another target for them.
One last point all these systems can dial out to a central station which calls the police. I have one that charges $6 a month, they do the same service as the higher priced ones that rip you off for a lot more $$$.
It doesn't matter where they are located.
The most important part of any alarm system is the sign in front of your home..........
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