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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. 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.

  4. 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 ...

  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. List of Illinois area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Illinois_area_codes

    With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the northern part of Illinois, 708, eventually received such with area code 464 taking effect on January 21 ...

  7. Reverse telephone directory - Wikipedia

    en.wikipedia.org/wiki/Reverse_telephone_directory

    An unpublished number is also excluded from directory assistance services, such as 411. Landline telephone companies often charge a monthly fee for this service. As cellular phones become more popular, there have been plans to release cell phone numbers into public 411 and reverse number directories via a separate Wireless telephone directory ...

  8. Area code 312 - Wikipedia

    en.wikipedia.org/wiki/Area_code_312

    The Chicago-based Christian rock group Resurrection Band released a song called "Area 312" on their 1982 album DMZ [6] Portions of the film RoboCop 2 were filmed in the Chicago area. A telephone number written on an abandoned building is (312) 555-7890. The Snoop Dogg song "That's That", contains the lyrics: "Girl if you ever in the 312, holla ...

  9. Dialed Number Identification Service - Wikipedia

    en.wikipedia.org/wiki/Dialed_Number...

    For DNIS service, the telephone company sends a sequence of typically four to ten digits during call setup. [1] Direct inward dial (DID) service also provides DNIS. For example, a company may have a different toll-free telephone number for each product line it sells, or for multilingual customer support.