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2. North American Numbering Plan - Wikipedia

   en.wikipedia.org/wiki/North_American_Numbering_Plan

   International access. 011. List of dialing codes. The North American Numbering Plan (NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably ...

3. Ten-digit dialing - Wikipedia

   en.wikipedia.org/wiki/Ten-digit_dialing

   Ten-digit dialing. Ten-digit dialing is a telephone dialing procedure in the countries and territories that are members of the North American Numbering Plan (NANP). It is the practice of including the area code of a telephone number when dialing to initiate a telephone call. When necessary, the ten-digit number may be prefixed with the trunk ...

4. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...

5. N11 code - Wikipedia

   en.wikipedia.org/wiki/N11_code

   This U.S. road sign alerts highway users to the availability of 9-1-1 service. An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP). The mnemonic N stands for the digits 2 through 9 and thus the syntax stands for the codes 211, 311, 411, 511, 611, 711, 811 ...

6. National conventions for writing telephone numbers - Wikipedia

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

   Mobile phones require full 10-digit number which starts with 3-digit non-geographical area codes 900–990. For international calls abroad or international roaming calls to Russia, E.123 international notation with an international call prefix '+' is the only allowed calling number format. For local calls both 8 and 7 are accepted as a trunk code.

7. Telephone numbering plan - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbering_plan

   A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. [1] Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined in each of ...

8. Toll-free telephone number - Wikipedia

   en.wikipedia.org/wiki/Toll-free_telephone_number

   An automated toll-free service was introduced by AT&T in 1966 (US ... a four- or seven-digit phone number. However, there are restrictions. ... exists where 6 or 10 ...

9. Original North American area codes - Wikipedia

   en.wikipedia.org/wiki/Original_North_American...

   The original North American area codes were established by the American Telephone and Telegraph Company (AT&T) in 1947, after the demonstration of regional Operator Toll Dialing during the World War II period. The program had the goal of speeding the connecting times for long-distance calling by eliminating intermediary telephone operators.