iPhone 4 or 4S? A screenshot of Siri on an iPhone 4. Image: Jon Snyder/Wired.com

These Siri hacks are getting serious. The latest one is the work of two veteran hackers, and, unlike previous Siri ports, is technically legal — though legal certainly doesn’t mean the same thing as “endorsed by Apple.”

Grant Paul (chpwn on Twitter) and Ryan Petrich have hacked Siri, Apple’s virtual digital assistant, to run on any jailbroken iOS 5 device with a tool they call Spire. Petrich previously hacked an iPhone 3GS to run Siri, and Paul has a number of hacks available in the Cydia app store, where Spire is...