Virtual phone numbers in United States.

The United States under +1 shares its country code with Canada and 18 other NANP territories, but uses a flat 10-digit national numbering plan with over 250 area codes. American consumers and businesses are highly area-code-aware — a 212 Manhattan number reads differently from a 415 San Francisco number, and routing strategies often depend on matching the called party's local code.

Numbering plan

Major area codes by metro: 212/646/917 New York City, 213/310/323 Los Angeles, 415/650 San Francisco Bay, 312/773 Chicago, 305/786 Miami, 617/857 Boston, 206 Seattle, 713/832 Houston, 404 Atlanta, 202 Washington DC. Mobile numbers use the same area-code pool as fixed-line — there's no dedicated mobile prefix. Toll-free numbers cover 800, 833, 844, 855, 866, 877, 888.

Regulations

The FCC (Federal Communications Commission) regulates US numbering at the federal level, with state public-utility commissions playing a secondary role. Entry friction is among the lowest in the world — most US area codes activate instantly through Cliqtel without per-number documentation. Toll-free numbers are managed via the SMS/800 RespOrg system; vanity numbers (e.g. 1-800-FLOWERS) require a separate reservation process.

Common use cases

US numbers anchor virtually every SaaS sales operation targeting North American buyers, support lines for any product with US customers, and lead-generation campaigns where local-area-code matching materially lifts pickup rates. Toll-free 800 remains the gold standard for consumer service — but the modern 855, 844, and 833 ranges are functionally equivalent and often have better availability for vanity strings.