Now that the iPhone 4S has arrived, new owners of the smartphone have the opportunity to try out the much-hyped Siri voice assistant. Everyone who isn’t making the upgrade, though, won’t be able to officially use Siri. We make that stipulation, because it’s now looking likely that an effort to crack the app will lead to its eventual release for the jailbroken iPhone 4.

The big concern was that Apple might try to do something more extreme than checking what version iPhone you have, like build the app specifically to require hardware features not present on the original iPhone 4. Since there’s now a new processor being used, one theory was that the app would be compiled with the A5 in mind. It turns out that’s not the case, and (given the proper motivation) Siri should be capable of running on the A4.

Of course, it still remains to be seen just how important the A5′s speed is towards making the system usable, but that’s something to be worried-about further down the line. For now, work continues on bringing Siri to the iPhone 4 and the fourth-generation iPod touch.

Update: Apparently Steve Troughton-Smith has already managed to port Siri to the iPhone 4 giving one less reason to purchase a new Apple-phone (especially if you’re not sold on the A5 chip and the improved camera).

Source: CydiaHelp, Twitter