The 480 area code, a significant part of Arizona's telecommunication infrastructure, presents three key facts:

Geographic Coverage: The 480 area code primarily serves the Mesa region in Arizona, along with its surrounding areas. It encompasses two counties: Maricopa and Pima. The area code extends its services to a total of 18 cities, which include major ones like Phoenix, Chandler, Scottsdale, Gilbert, and Tempe​​​​.

Cities and Counties Covered: Specifically, the area code covers 17 cities, incorporating the aforementioned ones and others within Maricopa County and Pinal County. This expansive coverage reflects the area code's integral role in connecting various parts of Arizona​​.

Establishment and Origin: The 480 area code was assigned for use in Arizona starting on March 1, 1999. It originated from the 602 area code through a process of area code split or overlay. This change was part of a broader reorganization of area codes to accommodate growing telecommunication needs​​.

In summary, the 480 area code is a vital communication link in Arizona, covering key cities and counties, and was established in 1999 as a result of the expanding communication requirements in the region.