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  2. Communications in Guam - Wikipedia

    en.wikipedia.org/wiki/Communications_in_Guam

    Though Guam is a United States territory, some U.S. long-distance plans and courier services list Guam as an international location.As a result of Guam's being added to the North American Numbering Plan (NANP) in 1997, calls made to the U.S., Canada, or other participating countries from Guam (or to Guam from other NANP locations) only require the caller to dial a 1 followed by the area code.

  3. 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.

  4. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    This means that to call another number within the same city or area, callers need to dial only a subset of the full telephone number. For example, in the NANP, only the seven-digit number may need to be dialed, but for calls outside the local numbering plan area, the full number including the area code is required.

  5. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    Finally, they sought the elimination of central office names and letter codes, and introduced all-number calling (ANC). The all-number calling plan increased the number of permissible central office prefixes from 540 to potentially 800, but the first two digits of the central office code were still restricted to the range 2 to 9, and the eight ...

  6. 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.

  7. Area code 671 - Wikipedia

    en.wikipedia.org/wiki/Area_code_671

    Prior to 2021, within Guam, only the seven-digit phone number was necessary. When a person in Guam calls anywhere in the United States or Canada, one simply dials "1" and then the area code and phone number. For callers in the U.S. or Canada calling to Guam, one first dials '1-671', followed by the seven-digit phone number.

  8. List of international call prefixes - Wikipedia

    en.wikipedia.org/wiki/List_of_international_call...

    This is a list of international dialing prefixes used in various countries for direct dialing of international telephone calls.These prefixes are typically required only when dialling from a landline, while in GSM-compliant mobile phone (cell phone) systems, the symbol + before the country code may be used irrespective of where the telephone is used at that moment; the network operator ...

  9. Short code - Wikipedia

    en.wikipedia.org/wiki/Short_code

    Calls to mobile shortcodes may be free, or may be charged per call or at a per minute rate. Where the number can be called from any mobile network, the same charge will apply from all networks. Messages sent to mobile shortcodes may be charged at a "standard rate", or with an additional premium charge.