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  2. 10-10-321 - Wikipedia

    en.wikipedia.org/wiki/10-10-321

    10-10-321, 10-10-345, 10-10-220, and 10-10-987 are United States long-distance phone services best known for their prolific television and direct mail advertising in the late 1990s. 10-10-321 was the first mass-marketed service of its type. 10-10-345 was owned by AT&T, and the rest were all owned by MCI, which is now part of Verizon.

  3. Long-distance calling - Wikipedia

    en.wikipedia.org/wiki/Long-distance_calling

    Various feature groups were used where equal access is available to allow callers to select a long-distance carrier for each call. In feature group 'D', the current system, subscribers may dial the prefix "10" and a three-digit code identifying a long-distance carrier to handle the InterLATA call.

  4. Ten-digit dialing - Wikipedia

    en.wikipedia.org/wiki/Ten-digit_dialing

    For example, the Fort Knox Army base in Kentucky is served by area code 502, but its local calling area includes cities that are served by the 270/364 overlay complex. As a result, Fort Knox imposed ten-digit dialing for all off-base numbers when the 270/364 overlay was established in 2014. [5] Area codes (in blue) affected in the lower 48 states.

  5. North American Numbering Plan expansion - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering...

    A 9 would be inserted as the new second digit of all area codes (e.g. 212 would become 2912, 916 would become 9916). Permissive dialing would be allowed because exchange equipment, on detecting a 9 as the second digit of the area code, would respond appropriately to expect 11 digits, or 10 in the absence of a 9 in that position.

  6. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

    www.aol.com/19-dangerous-scam-phone-numbers...

    Quick Take: List of Scam Area Codes. More than 300 area codes exist in the United States alone which is a target-rich environment for phone scammers.

  7. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The first customer-dialed direct call using an area code was made on November 10, 1951, from Englewood, New Jersey, to Alameda, California. [6] Direct distance dialing (DDD) was introduced subsequently across the country. By the early 1960s, DDD had become commonplace in cities and most towns in the United States and Canada.

  8. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    In many areas of the NANP, the domestic trunk code (long-distance access code) must also be dialed along with the area code for long-distance calls even within the same numbering plan area. For example, to call a number in Regina in area code 306: 306 xxx xxxx — within Regina, Lumsden and other local areas

  9. National conventions for writing telephone numbers - Wikipedia

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

    E.123, national format: long-distance prefix and city code in parentheses (national format: long-distance prefix and settlement code in parentheses due to possible confusion needs constant additional clarification), п. 2.8 [11]), the phone number is separated from the code and separated by spaces +380 (44) 1234567