PHOENIX — Residents in three large area codes in Arizona will have to transition to 10-digit dialing later this year, the Arizona Corporation Commission announced. Those in the area codes of 480, 520, ...

PHOENIX (AP) - Starting Sunday, phone users in much of Arizona must include area codes when dialing to make all calls, including local calls that previously only required seven digits. As in many ...

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, under new federal regulations set to go ...