Search leader Yahoo Inc. announced on Wednesday that it is expanding its mobile search services to include sponsored search results, connecting its advertisers directly with mobile users.

The pre-release version of the service will affect Yahoo's U.S. and U.K mobile search customers. Consumers will be able to click on the sponsored search results to go to the advertisers' mobile web site or a landing page to get more information about the advertisers' offerings, including the ability to call the advertiser.

Our test deployments have been very successful, with strong advertiser demand and consumer engagement, which makes us very excited to bring our sponsored search listings to an even wider audience, said Steve Boom, senior vice president, mobile and broadband, Yahoo.

The company has already successfully launched the service in Japan, it said.