We all know that Siri is available exclusively on the iPhone 4S. There were a lot of speculations why Apple didn’t release it for the iPhone 4 as well, because as we can see with Spire, it works perfectly fine. CNET now reported that the A5 processor used in the iPhone 4S contains a special noise-reduction circuitry:
Why We Won’t (Officially) Get Siri On Our iPhone 4
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