Headsets are becoming more common in the car, at the fitness center, at work, and at play. California and other states require or will require "hands-free" calls made while driving. Some drivers have cars with built-in Bluetooth speakers and microphones, while others will buy wireless earpieces to make calls legally. WSJ All-Things-Digital columnist Walt Mossberg shows a model wearing Jawbone, a fancy fashion statement. Wonder when or if I'll ever wear one? Full more details on wireless headsets for cell phones,
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