A method of determining the physical location of a primary mobile computing device includes: collecting at least one locating factor through a data communications connection, wherein the at least one locating factor at least partially identifies a physical location of the primary mobile computing device, wherein the at least one locating factor includes a known position of a secondary mobile computing device; using an electronic processor, executing at least one software rule to make a location inference of the physical location of the primary mobile computing device, based on the at least one locating factor; and storing the result of the location inference for further use.