The 4 million iPhone 4S devices sold last weekend came complete with a unique voice-activated personal assistant, Siri. The service is perhaps the most buzzed-about feature found in Apple's new gadget. Siri allows the user to ask questions using conversational speech. This is primarily used to perform search or information requests, but it will also respond to a variety of more off-the-wall queries. So far, the biggest complaint about Siri has come from those unable to use it due to unavailable service.
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