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The Anatomy of Phone Number Formats Phone Number DialedLocation212-456-7890Domestic+1-212-456-7890International Phone Number1-212-456-7890Dialed in the US001-212-456-7890Dialed in Germany2 more rows

Seven-digit dialing is a telephone dialing procedure customary in some territories of the North American Numbering Plan (NANP) for dialing telephone numbers in the same numbering plan area (NPA). NANP telephone numbers consist of ten digits, of which the leading three are the area 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. Note: Make sure to remove any leading 0s or special calling codes. Phone numbers in Mexico (country code "52") need to have "1" after "+52", even if they're Nextel numbers.

Phone numbers in the U.S. consist of a 3-digit area code (e.g. 212), then a 7-digit local number (e.g. 924.0446).

LOOKING BACK: In 1967, seven-digit telephone numbers begin.

The telephone number consists of a three-digit central office (or exchange) code and a four-digit station number. The combination of an area code and the telephone number serves as a destination routing address in the public switched telephone network (PSTN).

For example, a telephone number in North America consists of a three-digit area code, a three-digit central office code, and four digits for the line 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.

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.

Therefore, we have 544320 ways of seven-digit phone numbers can be formed if the first digit cannot be 0 and repetition of digits is not permitted.