The first legal Siri port has been developed and released for jailbroken iPhone 4, iPhone 3G and 3GS, iPod touch 3rd and 4th generations, and both iPads, and it's called Spire. The way the tweak works is by using an external proxy server to mimic Apple’s own Siri servers, which are used exclusively for the iPhone 4S. Spire has a quick install and a simple setup that takes no time at all to get up and running. There are some minor issues with the method however, namely that for every iDevice connected to a proxy server, Apple is losing money. The problems don’t stop there though. This also leaves the "official" iPhone 4S Siri possibly open to vulnerability for use with these proxy servers, which can potentially lead to unreliability within the phone itself and possible personal information being leaked from all the connected devices.
Moving away from the negatives to the positive, looking at the Spire, it functions exactly like its older sibling for the iPhone 4S as you are not running it on the iPod Touch 3rd generation (the tweak takes full advantage of the external microphone.) Have you got Siri up and running on your jailbroken iPhone, iPad, or iPod touch?
One of the key differences between the iPhone 4 and iPhone 4S is the availability of Siri on the newer smartphone. There have been a few hacks and allegedly legal options that put Siri on older versions of the iPhone, but nothing officially sanctioned by Apple.
The latest Siri workaround comes from iOS hackers Grant Paul, known as chpwn, and Ryan Petrich. In a recent blog post, the duo unveiled Spire, which is a "new tool for installing Siri on previously unsupported, but jailbroken, devices," Paul said. As you might recall, an iOS 5 jailbreak was just released.
The 100MB download is available via Cydia and it will add Siri to any device running iOS 5.
If that sounds a bit too good to be true, though, it is. Actually getting Siri to work on a device other than the iPhone 4S will require some technical know-how.