LOL many of the third party headphones don't work on the Iphone, but the Zune headphones are one of the few that actually work.
Man people paid $500 to $600 and many of their 3 third party headphones don't work on Iphone.
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.
http://www.engadget.com/2007/06/30/iphone-doesnt-work-with-most-3rd-party-headphones/