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  2. Vodafone Idea - Wikipedia

    en.wikipedia.org/wiki/Vodafone_Idea

    Vodafone Idea, in acronym Vi, is an Indian telecommunications company, headquartered in Mumbai and Gandhinagar. [ 7 ] [ 8 ] [ 9 ] It is an all-India integrated GSM operator offering mobile telephony services.

  3. Unstructured Supplementary Service Data - Wikipedia

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

    USSD can also be used to refill the balance on the user's SIM card and to deliver one-time passwords or PIN codes. Some operators use USSD to provide access to real-time updates from social-networking websites including Facebook and Twitter. [3] Between 2012 and 2018, the Wikipedia Zero project provided access to Wikipedia articles via USSD. [4]

  4. SMS gateway - Wikipedia

    en.wikipedia.org/wiki/SMS_gateway

    A direct-to-mobile gateway is a device that has built-in wireless GSM connectivity. It allows SMS text messages to be sent and/or received by email, from Web pages or from other software applications by acquiring a unique identifier from the mobile phone's Subscriber Identity Module, or "SIM card". Direct-to-mobile gateways are different from ...

  5. 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).

  6. Short Message Service technical realisation (GSM) - Wikipedia

    en.wikipedia.org/wiki/Short_Message_Service...

    When the VMSC/SGSN indicates a Short Message delivery failure, the SMSC may send a message to the HLR, using the MAP_REPORT_SM_DELIVERY_STATUS procedure, indicating the reason for the delivery failure and requesting that the SMSC be put on a list of service centres wanting to be notified when the destination party becomes available again.

  7. Why do debit and credit cards have expiration dates? - AOL

    www.aol.com/finance/why-debit-credit-cards...

    Most of the time, your card issuer or bank sends you a new card right before your existing card expires. Credit cards and debit cards make in-person purchases much more convenient, and they make ...

  8. 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 ...

  9. Multi-SIM card - Wikipedia

    en.wikipedia.org/wiki/Multi-SIM_card

    Multi-SIM technology allows cloning up to 12 GSM SIM cards (of format COMP128v1) into one card. The subscriber can leave the original cards in a secure place and use only the multi-SIM card in day to day life. For telecom operator-provided cards, only the Group MSISDN number is known to multi-SIM subscribers.

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