The cell back up does not always work if there is not a good signal in your area. A contractor told me such bc my install did not have the best service in my area. I asked "so when the power goes out - that means I have not home security?" HE said "correct" Then I told him well I didnt want it. He told me I had no choice bc then it would be breach of contract and I would owe a cancellation fee.
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