United States is +1

A local writes 212 555 0123 — the dialer below turns that into what you press.

Country code
+1
Dialing out
011
Trunk prefix
none

The US anchors the North American Numbering Plan: 1 doubles as country code and long-distance prefix, there is no trunk zero, and 011 opens an international line. Unusually, nothing in a number says mobile — area codes are geographic for both. The 555 0100 to 0199 block in any area code is reserved for fiction, hence 212 555 0123.

Ten digits as area code plus seven, with no mobile-specific ranges — cell and landline look identical.

You dial

2125550123

Domestic call — dialed exactly as written. From any mobile, +1 2125550123 works worldwide.

Type the number the way a local writes it — the arithmetic is derived from each country's ITU plan.

Plan facts verified against ITU-T E.164 assigned country codes · North American Numbering Plan — Wikipedia. Prose is our own.

Plugs & voltage by Plugchord

From usKeychord— keyboard shortcuts for every app

Also on +1