According to Official Guinness Records,
With a thickness of 1.39 cm (0.55 in) and a 3.6 cm (1.43 in) colour screen, the LG GD910 Watch Phone is the first model in the world that allows video calls. First announced at the Consumer Electronics Show in Las Vegas, USA, the phone includes features such as a touchscreen, voice recognition. MP3 player and Bluetooth. It is currently scheduled to be available to the public sometime in 2009.
For a complete list of 2009 records, please visit 2009 Guinness Records in United States.