Sometime in the next five years or so, some southern Arizona residents are going to find out that their new neighbors have a different area code.

Tucson residents are among millions of Arizonans who will have to start dialing the area code along with the local seven-digit number when making phone calls this Sunday. The change — made to ...

Tucson's area code 520 was the most common local number used by robocallers in the U.S. last month, with more than 8.6 million calls generated, TNS data shows. Phoenix's 602, the East Valley's 480 and ...