A deal between YouTube and US mobile firm Verizon Wireless will see the popular video-sharing website extended to mobile phones.
Users who subscribe to Verizon's Vcast service will be able to view content on the YouTube website via their mobiles.
The trial, which will begin in December, will also allow users to post video clips from their phones more easily.
It is likely that similar tie-ups will follow as mobile operators look for a
slice of the social-networking pie.
More than 100 million video clips are viewed every day on the YouTube website.