Does anyone know of any recent examples of receiving data through the iPhone's audio jack? Thanks!
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Not an example but a method:
I would think the data is exchanged with different audio tones, perhaps FSK or another tone encoding scheme such as DTMF.

zaph
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I'm pretty sure your correct but I cannot figure out how to access the audio jack. – user3474775 Oct 26 '14 at 18:08
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The same way you obtain sound from the microphone through the audio jack. Look for Apple audio examples. – zaph Oct 26 '14 at 18:24