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  2. Vertical service code - Wikipedia

    en.wikipedia.org/wiki/Vertical_service_code

    A vertical service code ( VSC) is a sequence of digits and the signals star (*) and pound/hash (#) dialed on a telephone keypad or rotary dial to access certain telephone service features. [ 1] Some vertical service codes require dialing of a telephone number after the code sequence. On a touch tone telephone, the codes are usually initiated ...

  3. North American Numbering Plan - Wikipedia

    en.wikipedia.org/wiki/North_American_Numbering_Plan

    Numbering plan area code The first NYX block is the numbering plan area code. When the second and third digits are the same, the code is an easily recognizable code (ERC). ERCs designate special services; e.g., 800 for toll-free service. The NANP is not assigning area codes with 9 as the second digit. [35]

  4. Last-call return - Wikipedia

    en.wikipedia.org/wiki/Last-call_return

    The number for this facility varies with country and provider: United States and Canada: Vertical service code *69; 1169 on rotary phone/pulse dial telephones. The prompt voice behind most U.S. AT&T implementations of this feature is Pat Fleet. Where available, it is offered on a per-call charge (typically 50¢) or an unlimited-use monthly ...

  5. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

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

    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. The good news is that scam callers will often show up ...

  6. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    SIM lock. A SIM lock, simlock, network lock, carrier lock or ( master) subsidy lock is a technical restriction built into GSM and CDMA [ 1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks. This is in contrast to a phone (retrospectively called SIM ...

  7. Telephone number pooling - Wikipedia

    en.wikipedia.org/wiki/Telephone_number_pooling

    Telephone number pooling. Telephone number pooling, thousands-block number pooling, or just number pooling, is a method of allocating telephony numbering space of the North American Numbering Plan in the United States. The method allocates telephone numbers in blocks of 1,000 consecutive numbers of a given central office code to telephony ...

  8. Area code 404 - Wikipedia

    en.wikipedia.org/wiki/Area_code_404

    Area code 404 is a telephone area code in the North American Numbering Plan (NANP) for Atlanta, Georgia and its closest suburbs. This comprises roughly the area encircled by Interstate 285. It is an enclave area code, surrounded by area code 770, which serves most of Atlanta's suburbs. Both 404 and 770 are overlaid by area codes 678, 470, and 943 .

  9. 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. Guam and the Northern Mariana Islands are included in this region as parts of the United States.