Fully Ad-supported Free Mobile Phone Service to Launch in '07

Blyk, is an advertising-funded mobile phone service scheduled to launch in the United Kingdom in mid-2007, followed by other markets, the company said Thursday. The service will be aimed at consumers between the ages 16 and 24. The company hopes to go live in the U.K. by next year. Whether it actually makes this goal remains to be seen.
Blyk isn’t the first company to offer free mobile service in exchange for advertising rights, Harris said. Similar advertising-supported services were launched a few years ago for fixed-line phones, but "you really don’t hear anything about them anymore," Harris said.
Spotcast Communications launched an advertising-supported service in Hong Kong in 1999 but shut it down a year later.

Source