iPhone OS 3.1 is official, available today

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iPhone OS 3.1 is official, available today
Apple just announced iPhone OS 3.1, which includes Genius recommendations for the App Store. The update also brings a ringtone store, with over 30,000 ringtones at $1.29 a pop. 3.1 is available today for free to iPhone users and iPod touch users with 3.0.
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