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 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 ...

Have you ever noticed how area codes aren’t laid out as neatly numerically as, say, the U.S. Interstate Highway system? For the most part, interstate highway numbers tend to grow higher in value as ...