The iPhone 3GS captured 39% of iPhone OS requests in the latest AdMob report for March, followed by the 2nd generation iPod touch (25%) and the iPhone 3G (20%). The two most recent versions of the iPhone OS generate 86% of the traffic. In March 2010, 44% of iPhone OS traffic came from devices running iPhone OS 3.1.3 and 42% from iPhone OS 3.1.2.

The Android platform has experienced significant growth in monthly traffic over the past year. Android traffic has grown at a compounded monthly growth rate of 32% per month, going from 72 million requests in March 2009 to 2.0 billion in March 2010.

Two Android devices, the HTC Dream and HTC Magic, collectively represented 96% of Android traffic in September 2009. Seven months later, 11 devices represented 96% of Android traffic in the AdMob network. In March 2010, Android traffic share on the AdMob network was divided relatively evenly between the three primary versions of the Android OS: Android 1.5 (38%), Android 2.0 / 2.1 (35%) and Android 1.6 (26%).

Motorola was the leading Android manufacturer with 44% share of traffic in March 2010 due to the success of the Droid and CLIQ. HTC was a close second with 43% of requests, followed by Samsung with 9%.

AdMob overall worldwide traffic for March 2010 is up 18% month over month. AdMob ( stores and analyzes handset and operator data from every ad request in its network of more than 15,000 mobile web sites and applications.