The first iPhone 4S ad has aired on TV and very prominently features Siri, the voice-activated personal assistant exclusive to Apple's newest handset. The ad shows several people talking to their iPhones, asking questions, looking up directions, setting up reminders -- all in very natural language. Siri itself doesn't appear until near the end of the video, though, so people who've never heard of the feature before may find this commercial somewhat confusing at first.
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