Area Code 520

Local Presence for Tucson, Sierra Vista, Nogales, Douglass, and Bisbee

You can increase your connection rate up to 30% by dialing from a local number.

Local Presence by Tenfold gives you one-click access from your existing phone system to a local number in the US area code 520 and more than 200 others.

Reach out to customers in Tucson, Sierra Vista, Nogales, Douglass, and Bisbee.

Source: Wikipedia