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2. Near-field communication - Wikipedia

   en.wikipedia.org/wiki/Near-field_communication

   NFC is a set of communication protocols that enables communication between two electronic devices over a distance of 4 cm or less. NFC is based on inductive coupling and uses a frequency of 13.56 MHz, and has applications in data exchange, contactless transactions, wireless charging and more.

3. SIM Application Toolkit - Wikipedia

   en.wikipedia.org/wiki/SIM_Application_Toolkit

   SIM Application Toolkit (STK) is a standard of the GSM system that enables the SIM card to initiate actions for various value-added services. Learn about its advantages, limitations, applications, and updates for different network and card systems.

4. CCID (protocol) - Wikipedia

   en.wikipedia.org/wiki/CCID_(protocol)

   CCID is a USB protocol that allows a smartcard to be connected to a computer via a card reader. Learn about the hardware, software and applications of CCID devices, and the list of CCID providers.

5. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A SIM card is a smart card that stores an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile devices. The ICCID (integrated circuit card identification) is a unique serial number that identifies the SIM card itself.

6. 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. Learn about different types of card readers, such as magnetic, smart, contactless, and RFID, and how they work with various cards and applications.

7. ISO/IEC 7816 - Wikipedia

   en.wikipedia.org/wiki/ISO/IEC_7816

   ISO/IEC 7816 is an international standard for electronic identification cards with contacts, such as smart cards and SIM cards. It defines the physical characteristics, electrical interface, transmission protocols, security architecture, commands and data elements of the cards.

8. eSIM - Wikipedia

   en.wikipedia.org/wiki/ESIM

   eSIM is a form of SIM card that is embedded directly into a device, instead of a removable card. It can be re-programmed with new SIM information if compatible with eUICC standard, and operates the same as a physical SIM.

9. Host card emulation - Wikipedia

   en.wikipedia.org/wiki/Host_card_emulation

   Host card emulation (HCE) is a software architecture that allows mobile applications to emulate electronic identity cards using NFC. Learn about the history, impact, implementation and uses of HCE for payments, loyalty programs, access and transit passes.