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InMobi, one of the world's largest independent mobile ad networks, just announced that plans to enter the U.S. advertising market. The company - which already has offices in San Francisco and has currently served about 2 billion ad impressions in the U.S. following a soft launch in January - is currently one of the strongest mobile advertising players in the Asia Pacific market and also has a strong presence in Africa and Western Europe. In the U.S., InMobi will go up against entrenched players like AdMob, which was recently acquired by Google, and relative newcomers like Apple's iAd and Quattro Wireless.

InMobi, which is the largest mobile ad network in Asia, Africa, and Indonesia, just released some interesting data regarding mobile web usage which shows that RIM's BlackBerry is leading the pack ahead of Apple's iPhone in Indonesia. Indonesia is one of the world's fastest growing mobile consumer markets and will become the third largest mobile market by 2010. Apple, however, is currently losing the race against BlackBerry in this market. While InMobi saw requests from BlackBerry devices increase by 842% in the first half of 2009, requests from iPhones only increased by 205%.