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  2. Unstructured Supplementary Service Data - Wikipedia

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

    USSD on a Sony Ericsson mobile phone (2005). Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.

  3. USSD Gateway - Wikipedia

    en.wikipedia.org/wiki/USSD_Gateway

    USSD gateway is based upon the ability of the delivery agent or the source to send and receive USSD messages. A USSD is a session-based protocol. A USSD is a session-based protocol. USSD messages travel over GSM signalling channels, and are used to query information and trigger services.

  4. Card reader - Wikipedia

    en.wikipedia.org/wiki/Card_reader

    A card reader is a data input device that reads data from a card-shaped storage medium and provides the data to a computer. Card readers can acquire data from a card via a number of methods, including: optical scanning of printed text or barcodes or holes on punched cards, electrical signals from connections made or interrupted by a card's punched holes or embedded circuitry, or electronic ...

  5. How to make payments with your phone - AOL

    www.aol.com/finance/payments-phone-164336000.html

    If you are shopping in a physical store, open the Wallet app, select the card you’d like to use and hold your unlocked phone over the Tap to Pay card reader. The app will let you know once the ...

  6. Contactless payment - Wikipedia

    en.wikipedia.org/wiki/Contactless_payment

    EMV contactless symbol used on compatible payment terminals. EMV stands for "Europay, Mastercard, and Visa", the three companies that created the standard.Contactless payment systems are credit cards and debit cards, key fobs, smart cards, or other devices, including smartphones and other mobile devices, that use radio-frequency identification (RFID) or near-field communication (NFC) for ...

  7. Contactless smart card - Wikipedia

    en.wikipedia.org/wiki/Contactless_smart_card

    A contactless smart card is a card in which the chip communicates with the card reader through an induction technology similar to that of an RFID (at data rates of 106 to 848 kbit/s). These cards require only close proximity to an antenna to complete a transaction.

  8. SIM Application Toolkit - Wikipedia

    en.wikipedia.org/wiki/SIM_Application_Toolkit

    A more general name for this class of Java Card-based applications running on UICC cards is the Card Application Toolkit (CAT). [ 2 ] [ 3 ] The SIM Application Toolkit consists of a set of commands programmed into the SIM which define how the SIM should interact directly with the outside world and initiates commands independently of the handset ...

  9. MIFARE - Wikipedia

    en.wikipedia.org/wiki/MIFARE

    This makes it possible to use the same card with both readers that can read MIFARE Classic products (with sectors protected by 48-bit CRYPTO1 keys, "Security Level 1") and readers that can read MIFARE Plus products (with sectors protected by 128-bit AES keys, "Security Level 3"). This feature is intended to make it easier to gradually migrate ...

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