Till now, we know that Siri has been successfully ported to iPhone 4 and iPod touch 4G. Now it’s time for Siri on 3GS. That’s when iOS hacker and developer Ryan Petrich comes in. Ryan Petrich was able to successfully port Siri to the iPhone 3GS, with some help from Steven Troughton and chpwn. As we can see from the video, Siri works very well on the iPhone 3GS. However, according to 9to5mac Siri performs worse on the iPhone 3GS than the ported version for the iPhone 4 due to the iPhone 4 having a better microphone than the iPhone 3GS.