The numerical designation serves as a geographic identifier for telecommunication services. Assigned to a specific region, it precedes the seven-digit local number required to complete a call. As an example, calling a number within this zone requires dialing the identifier before the local number.
This particular designation facilitates efficient routing of calls within the North American Numbering Plan. Its introduction provided increased capacity for telephone numbers within the designated region. This expansion addressed the growing demand for telecommunication services and technological advancement in the region.