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

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

    The RespOrg is not the carrier. A Canadian carrier could be used for Canadian calls and a U.S. carrier for American calls; a user with many inbound local voice over IP numbers in multiple cities could convert toll-free calls on one main toll-free number to local calls in each city where it has a point of presence. Percentage Allocation routing

  3. North American Numbering Plan expansion - Wikipedia

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

    In NANP telephone number specifications, the letter N represents a numeral from 2 through 9, while the letter X represents any numeral. Thus, NXX is a number from 200 through 999, while XXXX is a range from 0000 through 9999. The first three digits of a telephone number are the numbering plan area code (NPA code, or simply NPA).

  4. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    Within the North American Numbering Plan (NANP), the administration defines standard and permissive dialing procedures, specifying the number of mandatory digits to be dialed for local calls within a single numbering plan area (NPA), as well as alternate, optional sequences, such as adding the prefix 1 before the telephone number.

  5. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    *51 and 1151 — a history of unanswered calls on a telephone number, useful for those who are not Caller ID subscribers *57 and 1157 — used to trace harassing, threatening, abusive, obscene, etc. phone calls, and keep results of trace at phone company *66 and 1166 — to keep retrying a busy-line (see also Called-party camp-on)

  6. Toll-free telephone number - Wikipedia

    en.wikipedia.org/wiki/Toll-free_telephone_number

    They are toll-free only when dialed from landlines, and charged the same as a land line when dialed from cell phones. In Malaysia the prefix is 1800. Free if calling from a land-line and VoIP only. Calling from mobile phone will be considered a local call, with varying charges depending on the mobile network providers. In Mexico the prefix is 800.

  7. Telephone number pooling - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_pooling

    Public resistance to the introduction of new area codes, whether as overlay complexes (which allowed customers to keep their existing numbers, but broke seven-digit local calling) or by area code splits (where the area code of existing numbers was changed), prompted the FCC and state commissions to introduce thousands-block number pooling, i.e. the allocation of number space in blocks of only ...

  8. Telephone numbers in the Americas - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_the...

    The prefixes in the Americas start with one of 1,2,5. All countries in the Americas use codes that start with "5", with the exception of the countries of the North American Numbering Plan, such as Canada and the United States, which use country code 1, and Greenland and Aruba with country codes starting with the digit "2", which mostly is used by countries in Africa.

  9. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). 7 Claro 8: Instituto Costarricense de Electricidad (Kölbi) Croatia +385: 91: 9: A1 Hrvatska: Due to Mobile number portability the prefix of an existing number does not determine the carrier. Any new number will follow the ...

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