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The format of the toll-free number is called a non-geographic number, in contrast to telephone numbers associated with households that are geographic. (Since the advent of cell phones and voice over IP, households can have any area code in the U.S., but it is still geographic in the sense that calls from that area code are considered local, but ...
The parentheses were used originally to indicate that the area code was not necessary for local dialing. The NPA-part of the number has the formal format NXX, since 1995 identical to the format of central office codes. The Government of Canada's Translation Bureau also recommends using hyphens between groups; e.g. 250-555-0199. [43]
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
This was accomplished by adding the digit "9" to the beginning of any phone number that started with a "9" (government and semi-government connections), and adding the digit "3" to any phone numbers that did not start with the number "9". [1] It is common to write phone numbers as (0xx) yyyyyyy, where xx is the area code.
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. If the numbering plan area does not use an overlay plan with multiple area codes, or if the provider allows it for other technical reasons, seven-digit dialing may be permissible for calls ...
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N11-numbers provide access to special services. For example, This US road sign reminds drivers and passengers about 5-1-1 service. 211: Community services and information; 311: Municipal government services, non-emergency number; 411: Directory assistance; 511: Traffic information or police non-emergency services