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Calling the USA: +1 is the US Country Code.

001, or +1 is the telephone calling code of North America; which includes Canada, the United States and the Caribbean.

You can use the “+” symbol in place of “011” if dialing from a cell phone. The “+” sign is usually the same key as “0” on a smartphone's keypad. Some countries share a country code. For example, Canada, the United States, some places in the Caribbean, and Guam share “1” as a country code.

Country code +1 is assigned to the United States and Canada because in the 1940s and '50s American Telephone and Telegraph Co. (Bell System) controlled more local phone companies in North America than anyone else, and was a major force in developing international direct dialing as we now know it.

Permissible numbers exclude easily recognizable codes N11, used for special services. Using 0 or 1 as the first digit of an area code or central office code is invalid, as is a 9 as the middle digit of an area code; these are trunk prefixes or reserved for North American Numbering Plan expansion.

The order of the number will be the country exit code ->+1 (US country code) -> area code -> 7-digit local phone number.

Format North American phone numbers To format a real phone number in the US, Canada, and other NANP (North American Numbering Plan) countries, enclose the area code in parentheses, and then hyphenate the three-digit exchange code with the four-digit number.

"+" signifies the international dialing prefix, "1" indicates the country code, in this case USA. e.g., some other countries: UK +44; Spain +34.

Calling the USA: +1 is the US Country Code.

001, or +1 is the telephone calling code of North America; which includes Canada, the United States and the Caribbean.

You can use the “+” symbol in place of “011” if dialing from a cell phone. The “+” sign is usually the same key as “0” on a smartphone's keypad. Some countries share a country code. For example, Canada, the United States, some places in the Caribbean, and Guam share “1” as a country code.

Country code +1 is assigned to the United States and Canada because in the 1940s and '50s American Telephone and Telegraph Co. (Bell System) controlled more local phone companies in North America than anyone else, and was a major force in developing international direct dialing as we now know it.

Permissible numbers exclude easily recognizable codes N11, used for special services. Using 0 or 1 as the first digit of an area code or central office code is invalid, as is a 9 as the middle digit of an area code; these are trunk prefixes or reserved for North American Numbering Plan expansion.

The order of the number will be the country exit code ->+1 (US country code) -> area code -> 7-digit local phone number.

Format North American phone numbers To format a real phone number in the US, Canada, and other NANP (North American Numbering Plan) countries, enclose the area code in parentheses, and then hyphenate the three-digit exchange code with the four-digit number.

"+" signifies the international dialing prefix, "1" indicates the country code, in this case USA. e.g., some other countries: UK +44; Spain +34.