All those desperate iPhone 4 users and older A4-powered device users who have been longing for the Siri functionality should be glad to know that they can have it without shelling out the bucks for a compatible device. Here’s how you can get Siri on iPhone 4 and iPod touch 4G:
(Note: You will need a jailbroken iPhone 4 or iPod touch 4G running on iOS 6. And you might end up with a bricked device, so follow this guide at your own risk!)
Precautionary Step: Ahead of getting started with the below guide, take a complete backup of your device.
Step#1: Open Cydia and head over to Manage > Sources > Edit > Add in order to include a new repository. Insert “http://repo.siriport.ru” in the bar and click on “Add Source”.
Step#2: Once the repository finishes reloading its data, look for the SiriPort (Original) iOS 6 package and install it on your device the way you always do it.
Step#3: Now that the package is completely installed on your device, reboot it and head over to the Settings.app and search the “SiriPort.Ru Original” option. Tap on this option and choose the “Install Certificate” option to install the mandatory verification certificate to allow communication between your device and the Siri server.
Now you have successfully installed Siri on your older A4-operated iOS 6 device. Open Siri and start using it!
Important: Siri may answer to your queries a bit late than usual. Since this is a tested method that is of course not up to the mark of the Siri running on iPhone 5, iPad 3 and iPod touch 5G.