Siri has been ported to the iPhone 4 and is now fully functional. The port is called H1Siri and can be found on 2 different Cydia repositories. The main one being http://Cydia.be and an alternate being http://iphone3gsystem.fr/cydia. We are still unsure how the hacker got this to work. It may be connecting to Apple’s server through a proxy. Due to the huge influx of traffic there have been reports of intermittent connectivity from multiple users.
Siri on iPhone 4S and now the iPhone 4 lets you use your voice to send messages, schedule meetings, place phone calls, and more. Ask Siri to do things just by talking the way you talk. Siri understands what you say, knows what you mean, and even talks back. Siri is so easy to use and does so much, you’ll keep finding more and more ways to use it.
DO NOT, and I repeat DO NOT! Uninstall this once its on your phone, majority of uses experience respring loops which as of this moment are only curable by restoring your device.