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E. 164 is the specification for a numeric telephone addressing scheme used by public switched telephone networks (PSTN) and various other data networks. E. 164 numbers can address any phone connected to a (PSTN) in the world.

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.

E. 164 numbers can have a maximum of fifteen digits and are usually written as follows: [+][country code][subscriber number including area code] . An example of a US number in the E. 164 format is +16175551212.

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.

The phone number normalisation is used to translate a phone number into a standard form. For example, there is E. 164 international standard which defines format as "[+] [country code] [subscriber number including area code] and can have a maximum of fifteen digits".

A Canadian E. 164 number consists of the single-digit Country Code ?1?, followed by a 10-digit NANP number consisting of a 3-digit Numbering Plan Area (NPA), commonly called the Area Code, a 3-digit Central Office (CO) Code, and a 4-digit Line Number.

The Anatomy of Phone Number Formats Phone Number DialedLocation+1-212-456-7890International Phone Number1-212-456-7890Dialed in the US001-212-456-7890Dialed in Germany191-212-456-7890Dialed in France2 more rows

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

Dial 1, the country code for the US and Canada. Dial the phone number, including area code.

The country code of USA is +1. It is unique for every country. Area codes are of two types ? local and toll-free. 800, 844, 855, 866, 877, and 888 are the different toll-free codes.