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"Japan's Willcom sure doesn't have a shortage of handsets that rock the foundation of what a wireless phone should be, so enter this entry: a handset inside a headset. Willcom's conceptual \"handset\" here (that will never be in your hand) will accept a Willcom W-SIM so that the wireless headset sitting on top of that noggin can actually make independent voice calls as well. Since W-SIMs integrate a PHS wireless receiver right onto the card itself, it's easy to give non-wireless devices that capability -- so why not let that music-laden set of headphones have some fun, right?[Via Slashphone]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/05/19/willcom-puts-whole-handset-inside-headphones/>