Baseball fans will be able to watch games on their cell phones this season under an agreement announced Monday by Idetic’s MobiTV and Major League Baseball’s interactive company, MLB Advanced Media.

The companies said the new agreement “expands and deepens” the audio service that MobiTV and professional baseball offered for the first time last year. The audio service allowed subscribers to pick from up to 30 feeds each game day. The exclusive agreement extends the audio service and adds the new video service for three years.

The audio service will go on sale Tuesday, and MobiTV expects it to be available on most major U.S. wireless networks by April 3, baseball season’s opening day. Various carriers will release their prices at that time, said Phillip Alvelea, CEO and chairman of Berkeley, California-based Idetic.

No launch date or price for the video service has been released. Aside from the live multimedia stream of games, subscribers will have access to highlights, stories, photos, statistics, box scores, ring tones, and team logos. The service will be subject to “blackout restrictions,” such as those that apply to cable and satellite television deals.

Mr. Alvelea said the market for mobile baseball game broadcasts is “tremendous,” and the announcement proves MobiTV has a leg up on competitors. Unlike clip-based services, MobiTV can provide live television, which brings immediacy to news and sports events, he added.

“People don’t want to wait to see things the next day, they want to see it as it’s happening and watch history unfold,” he said. Other devices, including TV watches and portable analog televisions, have been unsuccessful at getting premium content.

In a statement, George Kliavkoff, senior vice president of business development for MLB Advanced Media, said the company chose MobiTV because it allows fans a wide selection of announcers; it uses viewers’ existing cell phones; it supplies streaming live video to more handsets and wireless carriers than any other company; and it can black out service in specific markets, when needed. MobiTV was “the logical choice to introduce this exciting product,” he said.

Idetic, founded in 1999, has raised $21.5 million in two rounds of funding. Investors include Gefinor Ventures, Menlo Ventures, and RedPoint Ventures. When asked whether broadcasts for other sports leagues were in the works, Mr. Alvelea said fans should stay tuned for more announcements.

In October, MLB announced an 11-year, $650-million deal with XM Satellite Radio to broadcast every game beginning this season.