Apple’s iPod touch and iPhones continue to lead the market in the US while becoming increasingly popular in Western Europe and Asia, the latest AdMob statistics reveal.

Freshly-published statistics for June 2009 offer a pretty good view on the distribution of iPhone OS devices by country. AdMob the world’s largest mobile advertising platform, uses its own network data in combination with Apple’s own disclosed figures to make its estimates.

The good news – and let’s face it it’s obvious, is that worldwide adoption of Apple devices continues to grow. North America remains a key market for Apple’s handheld products, you’ll find 58 percent of iPhone and iPod touch users there.

Western Europe and Asia represent 26 and seven per cent of Apple device users, respectively. The worldwide ratio of iPhone to iPod touch users in the AdMob network was roughly two to one in June; although this varied from region to region, this ratio has remained relatively constant over the last several months, implying a similar growth rate for both devices worldwide.

54 per cent of iPhone and iPod touch users are in the United States. Following the US, France, Germany and the UK each had more than five per cent of all iPhone and iPod touch devices. iPod touch users represent 38 percent of total iPhone OS devices in North America.

Requests from the Android OS increased 25 per cent month over month. Android has five percent worldwide OS share and is now slightly ahead of Windows Mobile for the first time.

AdMob’s June 2009 Mobile Metrics Report also offers an estimated breakdown of the number of iPhone and iPod touch devices sold in various countries. The company estimates that there have been 13 million iPhone and 12 million iPod touch units sold to date in the US based on user data in AdMob’s network.

This analysis is based on the 16.8 million unique users on iPhone and iPod touch devices on the more than 7,000 mobile sites and 2,500 applications in AdMob’s network in June 2009.

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