The iPhone headphone jack with its super narrow opening is so recessed that most people simply can't use their personal headphones. The jack is too narrow, their plugs won't fit. Fortunately, Derek K. Miller has found a solution. The iPod Shuffle Sports Case ships with an adapter cable with an extra-thin plug. If you pop over to ebay and search for iPod shuffle sports case. If you're willing to wait for the right auction, you can likely pick up an adapter for just a few dollars.