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Couple of weeks back, Siri - Apple's revolutionary personal assistant feature, that is exclusively available only on Apple's iPhone 4S, was ported to iPhone 4. And last week it was also successfully ported to iPad and iPod touch.
However, at that time iPhone hacker and developer - Steven Troughton-Smith had only managed to get Siri's UI working as Apple was not authenticating commands on its servers from non-iPhone 4S devices.