If you haven’t given up and been wanting to install Siri on older generations of iOS devices, then you’ll have to grab the Spire. Spire is deemed as the first legal Siri port for jailbroken iPhone 4, iPhone 3GS, iPhone 3G, iPod Touch 4G and 3G and both iPad 1 and iPad 2.
The way the tweak works is having an external proxy server to mimic Apple’s own Siri servers, which are used exclusively for the iPhone 4S. Spire is simple to install and setup which takes no time for you to get it up and running on your device.
Siri hack on jailbroken iOS devices seems to be interesting. But having your iOS device to connect to the proxy server will expose your device to the risk of leaking your personal and causing instability of the device.
An interesting clip is included below showing a hacked Siri on a jailbroken iPhone 4S which allows other functions that can’t be done on a non-jailbroken device, including having Siri to translate from one language to another, launch an app, search YouTube and even having Siri to chat with you while you’re too bored.