I was recently in Japan and picked up in-store a Native Union Authentic Retro POP Phone Handset for Mobile Devices and Tablets
It isn’t something I’m carrying when I travel, but it is a welcome addition to the office. Best thing about it? It uses a regular headphone jack, so no worries about it working on my Android, iPhone, or BlackBerry.
Now, would I get away with driving in a car with this? :-)