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The USA country code is +1. You will add it to the beginning of any phone number you are dialing that's in the US. When you save your American contacts to your phone, make sure to include this number as part of their phone number!

General: The standard American telephone number is ten digits, such as (555) 555-1234. The first three digits are the "area code," which, in the past, indicated in what part of the country the phone was located.

Since the U.S. and Canada both use the North American Numbering Plan, the commonly accepted formatting of phone numbers is (NPA) NXX-X, NPA-NXX-X or 1-NPA-NXX-X. The 'NPA' is the area code, 'NXX' is the central office code, and 'X' is the subscriber number personal to each phone.

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.

For example, if a contact in the United States (country code "1") has the area code "408" and phone number "-X", you'd enter +1 408 X.

The traditional formatting of a phone number includes parentheses around the area code, and a dash between the exchange and the subscriber number. As design is largely about simplification, the dotted phone number does make sense. The traditional format includes 14 characters if you count spaces.

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.