Just a few days ago mobile app development firm applidium managed to crack the Siri protocol. While this does not mean anything for Siri on older iOS devices, it’s still quite interesting. What they’ve done allows virtually any device to interact with Siri’s servers. Unfortunately, to accomplish this you’ll need some data from a real iPhone 4S. Applidium’s tutorial for doing this is not very in-depth, so I thought I’d post a slightly more in-depth guide to getting the necessary data from an iPhone 4S. This guide assumes that you’ll be running Mac OS X 10.7.2, but in theory any UNIX operating system should work with a few simple tweaks.

Addendum: 

I’ve decided that it would be for the best if I were to remove this tutorial. When I initially wrote this, it was meant to be used for fun and experimentation, not for porting Siri to a non-4S device. I am certain that in the future if a full port of Siri is released to the public, the methods shown in this tutorial will be irrelevant. A Siri port cannot be distributed using the authentication ID’s from one iPhone 4S (you can read more about this here). If a full Siri port is ever released, it will undoubtedly be because someone figured out how to generate valid authentication keys on a non-4S device. Until then, all we can do is wait.