Just as Siri was previously ported over to the iPhone 4, a developer has now found a way for Siri to function on the iPad, which, goes without saying, was jailbroken. Of course, the catch, as with Siri on the iPhone 4, is that it does not interact with Apple's servers, therefore isn't fully functional on devices that are not the iPhone 4S. Developer @jackoplane managed to get Siri on the iPad 1, this comes a few weeks after Steve Troughton was able to get the personal assistant on a jailbroken iPhone 4. Troughton says that any jailbroken device can be made to look like the iPhone 4S and therefore Siri could even work with Google.
Siri on the iPad
Apple claims the reason they're restricting Siri to the iPhone 4S is hardware compatibility issues. On first thought, this makes sense as the iPhone 4S has higher processing power than other iDevices but of course, since it obviously works on the iPhone 4 and the iPad 1, it doesn't necessarily have anything to do with hardware. So the question is why. For one, it could be a way to boost iPhone 4S sales and for another, it could be a way to control traffic in the cloud. Siri first launched with periods of instability because so many users were using the service and the cloud. If iPhone 4 users joined the rush, of course, that would cause a bigger traffic jam than Apple could handle.