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  2. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  3. Area code 872 - Wikipedia

    en.wikipedia.org/wiki/Area_code_872

    With the implementation of 872, all local calls in Chicago must be dialed with the full 11-digit phone number (10 digits from cell phones). [ 1 ] The Illinois side of the Chicago area–312/773/872, 708/464 , 847/224 , 630/331 and portions of 815/779 –is one of the largest local calling areas in the United States; with few exceptions, no long ...

  4. List of Indiana area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Indiana_area_codes

    The 260 area code covers the northeast section of Indiana, including Fort Wayne and Angola. Prior to January 2002, the entire northern part of Indiana was under the 219 area code. Population growth and increases in cell phone numbers resulted in the 219 region being split into 3 sections.

  5. Telephone prefix - Wikipedia

    en.wikipedia.org/wiki/Telephone_prefix

    A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme. In other countries, both the prefix and the number may have ...

  6. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    This rounded the total number of digits in a subscriber telephone number to ten: a three-digit area code, a three-digit central office code, and four digits for each line. This fixed format defined the North American Numbering Plan as a closed numbering plan, [27] as opposed to developments in other countries where the number of digits was not ...

  7. National conventions for writing telephone numbers - Wikipedia

    en.wikipedia.org/wiki/National_conventions_for...

    The total length of the Subscriber Trunk Dialing code and the phone number is ten digits. The Subscriber Trunk Dialing code can have from two digits (11 or 011) up to four digits. Mobiles: Written as AAAAA-BBBBB for ease of remembering (though the prefix is either 2-digits or 4-digits in the numbering plan). Mobile numbers which are not local ...