There were some issues with the first release of SiriN1ght, which should now be resolved. To install SiriN1ght, all you need to do is add the repo http://cydia.zchristopoulos.com/ to Cydia.
Again, this does install ONLY the User Interface of Siri, you won’t be able to talk to Siri or connect to Apple’s servers, because you need authentication files from a jailbroken iPhone 4S. Once a jailbreak is available, SiriN1ght might get updated to a fully functional Siri Port.
We would currently not recommend installing SiriN1ght because it might break something and you have to restore (and as you may know, iOS 5.0.1 just got released and therefore you will have to restore to 5.0.1 and might lose the chance of an untethered jailbreak).
Some Users have reported that after installing SiriN1ght, they had several problems with iMessage, Spotlight search and video recording. Let us know in the comments if you have had similar problems.@SiriHacks folgen