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