Cingular will announce an on-demand mobile TV service that runs over its new 3G wireless network. The service is called Cingular Video; allowing viewers to select short three- to five-minute clips from 18 different channels, including selections from shows airing on the Cartoon Network, NBC and ESPN.

Cingular has partnered with media companies to offer content from sources such as Fox News, which will offer short clips of news, and HBO, which will offer clips of "The Sopranos," "Sex and the City," "Curb Your Enthusiasm" and "Entourage."

Cingular Video should be available free of charge to Cingular customers purchasing an unlimited 3G data package, which costs $19.99 per month. The data package also allows for unlimited text messaging, e-mailing and picture sharing over the network. To receive clips from HBO, customers will have to subscribe to a premium channel, which costs $4.99 per month.

Cingular's 3G network is currently available in Austin, Baltimore, Boston, Chicago, Dallas, Houston, Las Vegas, Phoenix, Portland OR, Salt Lake City, San Diego, San Francisco, San Jose, Seattle/Tacoma, and Washington.