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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   Both Android and iOS devices can natively scan QR codes without downloading an external app. The camera app is able to scan and display the kind of QR code along with the link . These devices support URL redirection , which allows QR codes to send metadata to existing applications on the device.

3. Near-field communication - Wikipedia

   en.wikipedia.org/wiki/Near-field_communication

   HCE allows any Android 4.4 app to emulate an NFC smart card, letting users initiate transactions with their device. Apps can use a new Reader Mode to act as readers for HCE cards and other NFC-based transactions.

4. List of most-downloaded Google Play applications - Wikipedia

   en.wikipedia.org/wiki/List_of_most-downloaded...

   This is the list of the Google Play apps with more than 500 million, and less than one billion downloads on unique devices: App. Developer. Date Reached [j] Date Published [k] Category. Pre-installed [l] LINE: Calls & Messages [218] Line Corporation.

5. Card reader - Wikipedia

   en.wikipedia.org/wiki/Card_reader

   A business card reader is a portable image scanner device or mobile app that uses optical character recognition to detect specific data fields on a business card and store that data in a contact database or 'electronic rolodex'.

6. 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.

7. Eye-Fi - Wikipedia

   en.wikipedia.org/wiki/Eye-Fi

   Scanner support. Some portable document scanners such as the Doxie Go + Wi-Fi and the Xerox Mobile Scanner make use of an Eye-Fi card to provide Wi-Fi capability for document upload.