Mobile ad firm AdMob today released a bit of data that provides an interesting glimpse into operating system versions being used on the iPhone and iPod touch. According to a survey of ad requests received during the week of September 15th-22nd, just after Apple's release of iPhone OS 3.1, 23% of aggregate users of the iPhone OS had already updated to iPhone OS 3.1. An additional 51% of users were running iPhone OS 3.0, with the remainder running earlier versions of iPhone OS.

204144 iphone os sept 09

Interestingly, AdMob notes that when data is broken out into iPhone versus iPod touch, a full 91% of ad requests from iPhones are from users running iPhone OS 3.0 or 3.1, while only 35% of iPod touch users are running some flavor of iPhone OS 3.0. The disparity highlights the effect of Apple's iPhone OS upgrade fees for iPod touch users, a phenomenon noted in previous reports from AdMob.

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