Apple just released firmware 3.0.1 to patch the SMS vulnerability which was revealed at Black Hat Conference 2 days ago. Please update your firmware via iTunes asap.
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From the look of it, Apple had already been working on the fix since they were informed about the vulnerability. I suspect that Apple intended to release the patch together with firmware 3.1. But they are forced to roll out the patch via 3.0.1 now because the vulnerability was unveiled.