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Can the NFC antenna of mobile phone such as the Galaxy S4 or iPhone in addition to their NFC functionality, also be used to read signals from (active) RFID tags/transmitters e.g. from 20ft away not 20cms?

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  • \$\begingroup\$ No. NFC using magnetic field, for short range. RFID use electromagnetic filed, for long distance. My answer on Physics.SE physics.stackexchange.com/questions/44037/… \$\endgroup\$
    – sigrlami
    Jul 8 '13 at 9:34
  • \$\begingroup\$ @ Sigrlami your answer on Physics stack exchange is brilliant!I'm new to the forum but are you able to expand on ways that this could be achieved? I assume that some sort of electromagentic device would need to intercept the active RFID tag signals and translate them to bluetooth or wifi to communicate with a smartphone? \$\endgroup\$
    – PatrickO'
    Jul 8 '13 at 12:41
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No. By default you can't do this, due to different principles of work and hardware chips. As I mentioned earlier my answer on Physics.SE clarify this.

About other possibilities, there were some projects, that provide external abilities, like Touchtag, which was on a market since 2008 to 2012. I think you can use same idea and then redirect data to audio or usb port. Then you will be need an application, to analyse incoming data.

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  • \$\begingroup\$ @PatrickO' could you accept answer? \$\endgroup\$
    – sigrlami
    Jul 19 '13 at 12:51

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