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I'm really doubting that the 4 has the necessary power to actually run Siri well. We'll see soon enough though, I guess.
 
The problem is that Siri needs to connect to Apple's servers, and therefore the second a hacked version of Siri appears, it'll simply be blocked.

I've said all along, Siri is not some super powerful, hardware sapping feature.

But we know by now, Apple keep anything from MMS to Home Screen Wallpapers to Siri as "exclusive" for the newest model.
 
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