Published: January 03, 2022
The more densely populated area of the state of Arizona with the city of Phoenix and its surrounding large and small communities is currently divided into 3 Numbering Plan Areas as follows:
From September 12, 2023 the 3 area codes mentioned above will overlay or will each cover the whole geographic area currently served by the 3 NPAs separately. This measure is to be implemented as the relief method for NPA 480.
With the implementation of the new overlay complex 480/602/623 no longer will subscribers to 602 and 623 telephone numbers be able to dial 7 digits when calling locally (10 digit dialing is already in use for area code 480).
See official NANPA document announcing the change with map of the area (PDF document).