T-Mobile this week unveiled the first phone to use the open-source Android operating system developed by Google and its partners. The G1, based on HTC's Dream handset, will be available in the United States starting October 22.
The T-Mobile G1 design is similar to that of the iPhone, but some differences distinguish the two. The G1 is bulkier than the iPhone, nearly 30 percent thicker, and almost 20 percent heavier. Nevertheless, it's a bit narrower than the iPhone and comes with a 320-by-480 touch screen. Below the screen, the bottom juts out slightly, with five buttons and a small BlackBerry-like trackball to aid screen navigation.