iOS 4 Installed On 50% of iPhones

A recent survey by online ad network Chitika reveals that 50% of iPhones are now running iOS 4. iOS 3 is installed on 49% of iPhones, while the 1% remaining still runs the older iOS 2.
Looking more deeply, iOS 4.0
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- AT&T Activates 3.2 Million iPhones This Quarter
- iPhone Coming To T-Mobile USA In Q3 2010?
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