According to AdMob’s May 2010 Mobile Metrics Report (PDF Link), more than half of all iOS users are outside of North America, compared to 67% of Android users and 58% of iPad users. 43% of iOS devices were in the U.S., followed by 9% that were in the U.K., 6% in France, and 5% in Canada. Notably, both iOS and Android represent much higher usage than share of handsets sold, with iOS representing 40% of mobile app and web usage compared to 15% handset marketshare; Android stood at 26% and 10%, respectively. iPhone’s worldwide share of traffic generated by smartphones stood at 39.9% in May, well above the second-place Motorola Droid with 6.8%, but down significantly from its 47.9% share in May 2009. AdMob’s Mobile Metrics Reports are based on data gleaned from the company’s network of more than 23,000 mobile Web sites and applications around the world.
AdMob: Less than half of iOS devices are in North America

Charles Starrett
Charles Starrett was a senior editor at iLounge. He's been covering the iPod, iPhone, and iPad since their inception. He has written numerous articles and reviews, and his work has been featured in multiple publications.