How to install siri on ipod touch 4,iphone 4,and ipad

Finally a full featured port that will give you an identical copy of SIRI found on the iPhone 4S. Very reliable and easy to install copy of siri called siriport.
1. All you need to do is first jailbreak on 5.1.1 using this video: 5.1.1 Jailbreak Video and then open Cydia, Hit “Manage”, “Sources”, “Edit”, “Add” and add the following source: “repo.siriport.ru”. Once that finishes, open that source and install “Siriport Original”. There are 2 packages, 1 for your iPhone/iPod & the other for your iPad.
2. Now Go to Settings and open the Siriport tab down below, then Click “Install Certificate”, this will take you to a new page where you can install the sertificate from. Once that is finished restart your iDevice. Once back up and running hold the home button and keep talking to siri, eventually She will start working and you will be good to go!