AdMob released their April 2010 Mobile Metrics report yesterday. As always, it’s full of a bunch of interesting information. However, one key piece of data stood out.

In the US, AdMob is reporting 10.7M iPhone OS and 8.7M Android devices accessed its network in April. That is a ratio of 1.2 iPhones for every one Android device. In the rest of the world, 16.8M iPhone OS and 2.9M Android devices accessed its network in April. That is a ration of 5.8 iPhones for every one Android device.

Why the big difference? The iPhone does not have a carrier exclusive relationship in the rest of the world as it does here in the US with AT&T. In fact, lets look at the ratio of iPhones to Android devices in a few select countries to show just how dominant the iPhone is in countries with no exclusivity:

Country Ratio Exclusivity
United States 1.2 AT&T
United Kingdom 6.6 None
France 10.2 None
Canada 10.8 None
China 0.8 China Unicom

Source data: AdMob Mobile Metrics Report, April 2010

I sure hope that Apple is getting paid well by AT&T, because the data confirms what I pointed out earlier this month – Apple is losing the opportunity to dominate the US smartphone market through its exclusive AT&T arrangement.

Head over to the Admob blog at metrics.admob.com to download the April 2010 Mobile Metrics report and the country specific data.