The BBC is reporting on the launch of Mobile TV in Japan. Whilst not the first launch, it may well be the largest given the high number of subscribers and the existing high-speed mobile networks.

Japan's 90m mobile phone users can already play video games, send emails and check websites on tiny handsets.

The new service has been carrying test transmissions for several months and will remain free while mobile operators assess its potential and the number of subscribers.

Broadcasters Nippon Television, fuji Television and TV Asahi are among the companies which have signed partnerships with mobile operators.

The availability of mobile content in Japan is on the rise, and the use of handsets for more than just making calls is also more prevalent, given the long existence of the high-speed i-mode network and compatible handsets.