In 1999 due to increasing population, the Phoenix area was split from the 602 area code into three separate area codes: 602, 623 and 480. A person's area code would depend on where they live.

The Boundary Elimination Overlay Relief Plan will result in the removal of boundaries between the areas that use 480, 602 and 623 area code, allowing all areas to be served by Phoenix. It requires ...

As the area codes came out, you were assigned one, but it was determined by your residential area. 480 was the East Valley, 602 was mostly central Phoenix, and 623 was the West Valley.

In 1999, metro Phoenix's 602 area code was split into 602, 480 and 623. Without the latest overlay change, the 480 code was on pace to exhaust its supply of numbers by early next year.

Anyone with a 480, 602 or 623 phone number will be affected by the change. Beginning Aug. 12, 602 or 623 phone numbers must dial the area code and phone number on all calls, including ones within ...