Although Google's Android mobile operating system now powers more smartphones than Apple's iOS, the latter still reaches more U.S. users thanks to devices such as the iPad and the iPod Touch, according to data from comScore.
The measurement firm estimated iOS powered an average of around 38 million devices in the three months ending February 2011, while Android reached just shy of 24 million over the same period.
The majority of mobile ad networks are capable of serving ads to iPad and Android devices as well as the iPhone, meaning advertisers could find larger audiences running campaigns across iOS devices than Android ones. Networks such as Google's AdMob, however, offer the ability to deliver ads to both.
|Apple iOS vs. Android OS Across Media Devices|
3 Month. Avg. Ending February 2011, U.S. Users Age 13+
|Total Installed Base (000)||Share of Users (%)|
|Source: comScore MobiLens|
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Jack Marshall was a staff writer and stats editor for ClickZ News from 2007 until August 2011.