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"As several tipsters have pointed out, the recessed iPhone headphone port means that a lot of third party headphones don't work properly: we've tested a few models already (you can see the current list after the break), but maybe you can help us out and let us know which models work / don't work in the comments -- and yes, if you have to press down on the jack to get both channels to play sound, we count that as not working. You'll need to buy a $10 headphone adapter if you want most third party headphones to function correctly, which sounds like a great business plan to us: just break an important device function, and sell the solution for fun and profit. For now, one of the few third party 'phones that do work are the Zune headphones.%Gallery-4439%Do Work &amp;bull; iPod headphones &amp;bull; Zune headphones (despite the tension in the air, the Zune's headphones do work on the iPhone)&amp;bull; Etymotic ER6i  Don't work &amp;bull; Shure E4c &amp;bull; Ultimate Ears Super.fi 5 Pro &amp;bull; Sony MDR-V150 &amp;bull; Generic wrap-around headphones &amp;bull; Grado SR80"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/06/30/iphone-doesnt-work-with-most-3rd-party-headphones/>