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Seven-digit (or local format) dialing is a procedure in North America that allows a caller to dial a local number without dialing its area code.

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.

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.

NPA (Number Planning Area) is the 3-digit area code that identifies a specific geographic area; NXX is the term used typically to represent the 4th-6th digits of a ten-digit telephone number (N = any digit 2-9, X = any digit 0-9); for example the NXX Code in 207-287-3831 is 287.

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

That dates back to the late 1940s when AT&T developed the North American Numbering Plan (NANP) to simplify dialing calls, mostly long-distance. The plan went into effect in 1951. NANP numbers include 10 digits: a three-digit area code and a seven-digit local number. The format is usually represented as NXX-NXX-X.

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.