SAN FRANCISCO - Google Inc is releasing a new version of its YouTube video app for iPhones that will for the first time feature advertising but won't have the benefit of being pre-loaded on Apple Inc's popular smartphones.

The new YouTube app will be available for download at Apple's App Store beginning on Tuesday, Google said in a blog on the company website on Tuesday.

Web-connected smartphones are increasingly important to YouTube's business. One billion of YouTube's daily video views now occur on mobile devices, said Google. Earlier this year YouTube said it was streaming 4 billion videos every day.

The new YouTube app for the iPhone will feature thousands of additional videos, according to the blog post, as well as improved features for finding videos and sharing videos on social networks.

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