Did you know that your cell phone, and cell phone company for that matter, has the ability to track your every movement? Sure, maybe you did, but did you know how or why this is possible? If not, I will break down the basics for you here. What is a call detail record? Cell phone companies keep call detail records, or “CDRs” for every cell phone associated with their network. A call detail record is legal proof of a service provided, and essentially the technical road map of a