Install Siri

Note: Do this at your own risk. You’re risking the stability of your device, and your privacy by doing this (see more below). You’ve been aptly warned.

Step 1: Jailbreak your iOS 6 device, and install Cydia using our step-by-step tutorial found here. Remember this is a tethered jailbreak.

Step 2: Open Cydia > Manage > Sources > Edit > Add > and type the following repo: http://repo.siriport.ru > Tap Add Source.

Step 3: Once the source is added, open the SiriPort.Ru source, and find the SiriPort (Original) iOS 6 package. Install that package.

Step 4: Once back to your Home screen, go to Settings.app and scroll down until you see SiriPort.Ru Original. Open this panel and tap Install Certificate. A Safari window with open. Tap Install Certificate, and then tap OK.

Step 5: This will bring you to the Install Profile screen. Tap Install, and then tap Install in the upper right-hand corner. You should see “Trusted” in green letters on the Profile Installed page. Tap Done and close Safari.

Step 6: Invoke Siri by holding the Home button, and say “Hi”. If Siri doesn’t respond, try again, and then try some more. Only after Siri replies and establishes a valid connection will she be usable. To me, this is the most frustrating part about the whole process, but I was able to connect successfully after a while.

Some report that you need to reboot your device in order to connect, but I just kept retrying and it worked for me. If retries don’t work for you, try to reboot, but being that this is a tethered jailbreak, it makes the process even more time consuming.

Note: it is not necessary to enable Siri from Settings > General > Siri. It’s already enabled by using this hack.

(Source and credit to http://www.idownloadblog.com)