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  2. 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).

  3. Airtel India - Wikipedia

    en.wikipedia.org/wiki/Airtel_India

    Airtel launched 4G services on mobile from February 2014. The first city to get the service was Bangalore. [24] [25] Airtel has started their 4G services in Karnal and Yamunanagar in Haryana on 16 June 2015. [26] Airtel 4G trials has been started in Delhi from 18 June 2015. [27] Airtel had 95,173,000 4G subscribers as of June 2019. [28]

  4. Bharti Airtel - Wikipedia

    en.wikipedia.org/wiki/Bharti_Airtel

    Bharti Airtel Limited is an Indian multinational telecommunications company based in ... 3G & GPRS, network information, activation date, user type (prepaid or ...

  5. List of mobile network operators in Asia and Oceania - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_network...

    Airtel. GSM – 900/1800 MHz ... a stark contrast from the 167.9 million before the mandatory sim card ... available for postpaid, request activation for prepaid ...

  6. 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.

  7. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    sim card of the new mobile company that will cost around 15 PEN. United States: 2003.11.24 0 Free iconectiv manages the Number Portability Administration Center (NPAC), the largest number portability system in the world. Consisting of seven regional systems, the NPAC facilitates number porting across all Service Providers in the United States.

  8. Unstructured Supplementary Service Data - Wikipedia

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

    USSD is commonly used by prepaid GSM cellular phones to query the available balance. The vendor's "check balance" application hides the details of the USSD protocol from the user. On some pay as you go networks, such as Tesco Mobile, once a user performs an action that costs money, the user sees a USSD message with their new balance.

  9. Jio - Wikipedia

    en.wikipedia.org/wiki/Jio

    Jio blamed its competitors Airtel and Vodafone for spreading rumours of "Reliance being an undue beneficiary in the farm bills", an allegation both the companies denied. [120] The company saw a loss of around 25 lakh (2.5 million) subscribers in Punjab and Haryana between November and December 2020. [121]

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