Is Siri available on the iPhone 3GS?

I have the iPhone 3GS and I'd like to know if Siri is available on my device. There are a few apps available on the app store, but I'm not sure if they will work.
also, could you give me a brief description on what Siri does?

Nope, the specific Siri function is only available on the iPhone 4S and above, however the Voice Assist IS available in the 3GS but it won't be as intuitive or useful for that matter. Youtube Siri to see what it does.

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