Hand-curated reading paths for the roles that work at the edge of voice — engineers, CX leads, RevOps, and the people keeping carriers honest.
Research, engineering deep-dives, and operator playbooks from the team routing 2.4M+ daily calls across 150+ countries.
Operator guides, area-code playbooks, and the voice-infra deep dives our team ships every week.
The 480 area code covers Scottsdale, Mesa, Tempe, and Chandler in Arizona's East Valley. Discover its history, dialing rules, and how to get a local business number.
The 512 area code covers Austin and Central Texas. Discover its history, the 737 overlay, time zone, scam alerts, and how to get a 512 number for business.
The 561 area code covers Palm Beach County, Florida. Discover its history, the 728 overlay, time zone, scam alerts, and how to get a 561 number for business.
The 570 area code covers Northeast Pennsylvania. Discover its history, the 272 overlay, time zone, scam alerts, and how to get a 570 number for business.
The 586 area code covers Warren, Sterling Heights & Macomb County, Michigan. Explore its history, time zone, scam call alerts & how to get a local business number.
The 608 area code covers Madison, La Crosse, Janesville & southwestern Wisconsin. Explore its history, 353 overlay, time zone, scam alerts & how to get a local business number.
The 609 area code covers Central and South Jersey. Discover its history, the 640 overlay, time zone, scam alerts, and how to get a 609 number for business.
The 610 area code covers Allentown, Reading, Bethlehem & the Lehigh Valley in Pennsylvania. Explore its history, time zone, scam call alerts & how to get a local business number.
The 612 area code covers Minneapolis and the urban core of the Twin Cities. Explore its history, three-way split, time zone, scam alerts & how to get a local business number.
The 614 area code covers Columbus and Franklin County, Ohio. Explore its history, 380 overlay, time zone, scam alerts & how to get a local business number.
The 619 area code covers San Diego. See its history, how it merged with 858 in 2018, the cities it covers, and how 10-digit dialing works today.
The 621 area code covers Houston and its metro area as the newest overlay. Explore its 2025 launch, coverage, time zone, scam alerts & how to get a local business number.
The 623 area code covers Phoenix's West Valley, including Glendale, Peoria, and Surprise. Learn its history, time zone, scam alerts, and how to get a 623 number.
The 628 area code covers San Francisco, Marin County & San Mateo County as a 415 overlay. Explore its history, time zone, scam alerts & how to get a local business number.
The 630 area code covers Naperville, Aurora & DuPage County, Illinois. Explore its history, 331 overlay, time zone, scam alerts & how to get a local business number.
The 631 area code covers Suffolk County on Long Island, New York. Explore its 1999 split from 516, 934 overlay, time zone, scam alerts & how to get a local business number.
The 650 area code covers San Mateo County and northern Silicon Valley. Explore its 1997 split from 415, time zone, scam alerts & how to get a local business number.
The 651 area code covers St. Paul and the eastern Twin Cities suburbs. Explore its 1998 split from 612, time zone, scam alerts & how to get a local business number.
The 657 area code covers Orange County. See how it overlaid 714 back in 2008, the cities it covers, and how 10-digit dialing works there today.
The 660 area code covers rural northern and western Missouri. See how it split from 816 in 1997, the cities it covers, and how dialing works there today.
The 661 area code covers Kern County and the Santa Clarita and Antelope Valleys. Learn its history, time zone, scam alerts, and how to get a 661 number.
The 682 area code covers Fort Worth, Arlington & Tarrant County as an 817 overlay. Explore its 2000 launch, coverage, time zone, scam alerts & business number tips.
The 702 area code covers Las Vegas and Clark County. See its history, the cities it reaches, and how to get a 702 number for your business fast.
The 703 area code covers Arlington, Fairfax & Alexandria in Northern Virginia. Explore its 1947 origin, 571 overlay, time zone, scam alerts & business number tips.