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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. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    The subscriber number is the address assigned to a telephone line or wireless communication channel terminating at the customer equipment. The first few digits of the subscriber number may indicate smaller geographical scopes, such as towns or districts, based on municipal aspects, or individual telephone exchanges ( central office code ), such ...

  4. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    The feature requires the customer dial a 950-xxxx number and enter a calling card number and destination telephone number. It was originally used for locations where 101-xxxx dialing was not possible. 958-xxxx (local); 959-xxxx (long distance) — Plant test numbers, such as automatic number announcement circuits.

  5. 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.

  6. Mobile network codes in ITU region 3xx (North America)

    en.wikipedia.org/wiki/Mobile_network_codes_in...

    This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean.

  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 mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Unlimited outgoing international calls to US numbers over WiFi calling. [567] [568] Yes [568] Owned by Verizon [569] Operates on Verizon's native 4G/LTE network and WiFi calling (no 3G – Verizon will shut this down at the end of 2020 anyway or roaming- some reports of LTEiRA roaming with talk and text).

  9. 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 ...