Yes, Siri has already been ported to the iPhone 4. This task was accomplished by “using the 4S Siri and Springboard files, and some serious elbow grease, no doubt.” Continue reading to see the hack in-action.

Currently, the hack is missing an iPhone 4 GPU driver that keeps things running buttery smooth on the elder phone, and Cupertino won’t authenticate Siri’s commands coming from it either.

[via Engadget]