This is How to Install Siri on Most IOS Devices!

Ok so this will work with Iphone 3GS and 4, Ipod touch 3G and 4G and the Ipad 1 and 2. You will need to be JailBroken on IOS 5.0.1 which is an unthered one so thats good! :) You might be thinking oh no im on IOS 5.1,5.1.1 or higher not to worry you can downgrade just check out my blog here. So once you have done all that and your JailBroken on IOS 5.0.1 follow these instructions for Siri :

1. Open up Cydia and search for Spire.
2. Make sure you have a strong wifi connection that does not easily cut out because spire takes a long time to install. Reboot after installation of spire.
3. Once installed open up settings scroll down to Spire and select 'proxy host' then put in this host : https://siri.wordjelly.com:4443
4. Go back to settings home page then select 'General/Siri' and turn siri on. 
5. One more step to go before done so keep reading... Go into safari on your device and type this URL in : https://www.wordjelly.com/cacert.pem
It will then prompt you to install that certificate install it and once thats done you now have a working siri on your Idevice.

Note : Siri will not be exactle the same as on the Iphone 4s because most likaly that your mic is not as good as the 4s's.