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Siri is exclusive to the iPhone 4S. However, the iPad has a similar 'Dictation' feature that allows users to enter text by speaking into the device. It's hardly the most private way of typing an email on the way to the office, but it works well and is a popular feature with its users.
Perhaps it is time to bring Siri to the iPad, considering we now know its iPhone 4S exclusivity is likely not due to a hardware limitation of the device?