Now people that love Yahoo  can use their favorite company’s tools all in their purple-yellow glory. Not that you couldn’t access most of these services from some other app or via mobile web, but native app is the best way to go.

Anyway, to grab Yahoo’s iPhone apps, simply search for “Yahoo” in iTunes and take it from there…

On Thursday T-Mobile said it would use Yahoo’s OneSearch as the default search tool on its phones. T-Mobile is rebranding its mobile Web service and calling it Web2go. This service is supposed to provide a better Web browsing experience and easier navigation through a home page on T-Mobile’s mobile phones. And it integrates Yahoo’s OneSearch tool into it.

Also as part of the deal, Yahoo will offer sponsored search results and in some cases display advertising within the search results presented through T-Mobile’s Web2go service. The companies will share the advertising revenue, but further details weren’t given.

With close to 3 billion mobile phone users around the world, every major search company is vying for a piece of the action. They’re also competing for a piece of the emerging mobile advertising market, which is still in its infancy. As a result, the stakes for the three main search giants–Google, Microsoft, and Yahoo–have never been higher.

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