user10610: How can we monitor audio of subject using headphone while recording video using iphone or samsung galaxy s4?
I want to monitor audio while recording video using smartphone 

user3592: You could use an adapter to split the cell phone jack into XLR & 3.5mm.  Then just plug in your XLR mic and headphones.
Or you could record double-system audio.  Get a second, purpose-built audio recording device like a Zoom, and monitor that while you shoot with your cell phone.  It's super easy to match up the audio again in most editing software nowadays.  

10610: <p>How can we monitor audio of subject using headphone while recording video using iphone or samsung galaxy s4?</p>

<p>I want to monitor audio while recording video using smartphone </p>
 3592: <p>You could use an <a href="http://www.bhphotovideo.com/bnh/controller/home?O=&amp;sku=765531&amp;gclid=CjwKEAjwuoOpBRCSy6yQm66J1g8SJABrXW481DvXRpCNNzYNEDvuQmE7jkfKqaEc7wMJji9HRVbVoBoCVrjw_wcB&amp;Q=&amp;is=REG&amp;A=details" rel="nofollow">adapter</a> to split the cell phone jack into XLR &amp; 3.5mm.  Then just plug in your XLR mic and headphones.</p>

<p>Or you could record <a href="http://en.wikipedia.org/wiki/Double-system_recording" rel="nofollow">double-system audio</a>.  Get a second, purpose-built audio recording device like a <a href="http://www.bhphotovideo.com/c/product/699403-REG/Zoom_H1_H1_Ultra_Portable_Digital_Audio.html" rel="nofollow">Zoom</a>, and monitor that while you shoot with your cell phone.  It's super easy to match up the audio again in most editing software nowadays.  </p>
