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  2. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    The user submits a code corresponding to the service available. USSD can be used to provide independent calling services such as a callback service (to reduce phone charges while roaming), enhance mobile marketing capabilities or interactive data services. USSD is commonly used by prepaid GSM cellular phones to query the available balance.

  3. 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.

  4. List of mobile virtual network operators in the United States

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

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  5. MTN Group - Wikipedia

    en.wikipedia.org/wiki/MTN_Group

    MTN Group Limited (formerly M-Cell) [2] is a South African multinational corporation and mobile telecommunications provider. Its head office is in Johannesburg. [3] [4] MTN is among the largest mobile network operators in the world, and the largest in Africa.

  6. Public land mobile network - Wikipedia

    en.wikipedia.org/wiki/Public_land_mobile_network

    In telecommunication, a public land mobile network (PLMN) is a combination of wireless communication services offered by a specific operator in a specific country. [1] [2] A PLMN typically consists of several cellular technologies like GSM/2G, UMTS/3G, LTE/4G, NR/5G, offered by a single operator within a given country, often referred to as a cellular network.

  7. Dynamic Discount - Wikipedia

    en.wikipedia.org/wiki/Dynamic_Discount

    Dynamic Tariffing (also known as Dynamic Discounting or Dynamic Discount Solution) [1] [2] is the technology used by MTN Group, [1] the Africa and Middle East telecoms provider, [2] [3] to operate MTN Zone, a prepaid-per-second billing price plan that offers potential discounts of up to 95 per cent on mobile phone calls for MTN prepaid subscribers making on-network calls.

  8. Mobile country code - Wikipedia

    en.wikipedia.org/wiki/Mobile_country_code

    Mobile country code Country ISO 3166 Mobile network codes National MNC authority Remarks 289 A Abkhazia GE-AB List of mobile network codes in Abkhazia MCC is not listed by ITU 412 Afghanistan AF List of mobile network codes in Afghanistan 276 Albania AL List of mobile network codes in Albania 603 Algeria DZ List of mobile network codes in Algeria 544 American Samoa (United States of America ...

  9. Carrier-sense multiple access with collision avoidance

    en.wikipedia.org/wiki/Carrier-sense_multiple...

    It is particularly important for wireless networks, where the alternative with collision detection CSMA/CD, is not possible due to wireless transmitters desensing (turning off) their receivers during packet transmission. CSMA/CA is unreliable due to the hidden node problem. [3] [4] CSMA/CA is a protocol that operates in the data link layer.