• ZDNet, Wednesday, May 26, 2010 2:03 PM

There were 8.7 million Android OS devices and 18.3 million iPhone OS devices -- iPhone, iPad and iPod Touch -- in the US last month, according to new findings from mobile ad AdMob. As ZDNet notes, "the April release of the iPad in the US surely gave Apple a boost there, and that factors down to a 2 to 1 ratio of iPhone OS to Android devices."

Worldwide, AdMob found that there were 11.6 million Android OS devices versus 40.8 million iPhone OS devices, producing a 3.5 to 1 ratio. Meanwhile, the greatest concentration of Android OS devices remain in North America --75% -- compared to Asia -- 12% -- and Western Europe -- 11%. Also of note, iPhone OS distribution appears to be spread wider across the world, while the biggest concentration is also in North America with 44% in the US and 5% in Canada.

Read the whole story at ZDNet »