Yes I've jailbroken it in 2.01 and 2.02 and currently it is restoring to JB 2.1. Non jaibroken I think the iphone is close to as useful as a regular cell phone with several hundred semi useless app and about a dozen useful ones, MUCH less useful than a WM device.

But JBing it really changes it into an entirely new device. If you come from the hardcore world of WM devices and enjoy their openness then you could never live with an unjailbroken iphone.

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iPhone 3GS !!