Short description of The Phone Exchange 2.00: A database reference tool that allows you to take any US and Canadian phone number and determine its physical location and local time using the 3 digit area code and 3 digit exchange. For example, with the phone number 540-371-3915, the number 540 is the area code, and 371 is the local phone exchange. Based upon these two numbers (540 and 371), and using this software program, you will discover that this number is located in Fredericksburg, VA.