A computer-based method for inferring a location of a mobile computing device comprises the steps of using the mobile computing device to receive data about one or more devices present in a first location at a first time, including those devices available for connection; assigning an identification code to each device present in the first location; storing said data and identification code for each device present in the first location in a database; receiving new data about each device present in a location at a subsequent time, including those devices available for connection to the mobile computing device; and inferring that the mobile computing device is at the first location by comparing the new data to the stored data and identification codes.