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. The Phone Exchange is a database reference tool that allows you to take any US and Canadian phone number and determine its physical location. Using the 3 digit area code and 3 digit exchange, The Phone Exchange will provide you with the name of the city and state (or province) plus the current time where that phone number originates from. The area code is the first 3 digits of a telephone number and indicates a geographical area. It directs telephone calls to particular regions on a telephone network where they are then routed by the local telephone network based upon the next 3 digits. These next 3 digits (which follow after the area code) are referred to as the local exchange number. For example, with the phone number 540-371-3905, 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, Viriginia. At the same time you will be shown the current local time at Fredericksburg. The Phone Exchange makes it easy to trace a phone number to its original physical location.