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  2. SIM Application Toolkit - Wikipedia

    en.wikipedia.org/wiki/SIM_Application_Toolkit

    SIM Application Toolkit (STK) is a standard of the GSM system which enables the subscriber identity module (SIM card) to initiate actions which can be used for various value-added services. [1] Similar standards exist for other network and card systems, with the USIM Application Toolkit (USAT) for USIMs used by newer-generation networks being ...

  3. Unstructured Supplementary Service Data - Wikipedia

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

    USSD can be used for WAP browsing, prepaid callback service, mobile-money services, location-based content services, menu-based information services, and as part of configuring the phone on the network. [1] The service does not require a messaging app, and does not incur charges. [2] USSD messages are up to 182 alphanumeric characters long.

  4. Telecommunications in South Africa - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_in...

    Telkom was incorporated on 30 September 1991 as a public limited liability company registered under the South African Companies Act, 61 of 1973, as amended. [15] In 1993 GSM was demonstrated for the first time in Africa at Telkom '93 in Cape Town. In 1994 the first GSM networks in Africa were launched in South Africa. [16]

  5. Telkomsel - Wikipedia

    en.wikipedia.org/wiki/Telkomsel

    It is headquartered alongside Telkom in the Telkom Landmark Complex. Telkomsel is the largest cellular telecommunication carrier in the country with 169.5 million customer base as of 2020. [ 2 ] The company operates their GSM network on the 900–1800 MHz frequency range, as well as 3G , 4G , and 5G services on other frequencies.

  6. SIM card - Wikipedia

    en.wikipedia.org/wiki/SIM_card

    A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

  7. Telekom Networks Malawi - Wikipedia

    en.wikipedia.org/wiki/Telekom_Networks_Malawi

    Telekom Networks Malawi is a leading telecommunications network provider in the country. As of December 2020, the telco had assets worth MWK:120,528,540,000 (US$155.6 million), with shareholders equity worth MWK:43,905,850,000 (US$56.7 million).

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