It cost $20/year and $1/device/month per Verizon. It works good. Accurate to within 400 feet, though a lot closer has been my experience.
https://www.verizonwire
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It cost $20/year and $1/device/month per Verizon. It works good. Accurate to within 400 feet, though a lot closer has been my experience.
https://www.verizonwire