Can siri be put on the iPhone 4, and be used like an iPhone 4s?

It will be a white 16 gb iPhone At and T, if that matters and I will jailbreak it.

No its hardware related also. It would be bad performance if it was used on 4. Saying something is "the same as siri" as the earlier poster said is complete nonsense.

Yes siri can be put on any 3gs or 4.
jailbreak and add siriport from cydia, its the same siri thats on the 4s.

siri was a app from the apps store worked on all ios devices, apple pulled it.
you can still put it on any 3gs or 4 and infact its much better than the 4s siri.
it can tell scores, battery life and open apps, thing the 4s has to wait til ios 6 is released.