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siri assistantA fully functioning port of the iPhone 4S’s hyped Siri voice assistant is now available for almost all jailbroken Apple mobile devices and huzzah, it’s legal!

The somewhat gimmicky Siri assistant has been the focus of the iPhone 4S’s advertising campaign, and the feature is suspected to be helping fuel major sales for that device. But as the program only officially works on the iPhone 4S, other iPhone owners have been wanting to get in on the action. To date, the options have been either illegal or fairly technical in execution.

But now a new hack called Spire allows for almost any jailbroken iPhone or iPad to run the lusted-after Siri. Specifically, it allows Siri to work on a jailbroken iPhone 4, iPhone 3GS, third-gen iPod touch, fourth-gen iPod touch and first-gen iPad.

The free Spire app is available to download from the Cydia app store on jailbroken devices and takes about 100MB of space. The jalibreak developers who created it, Chpwn and Ryan Petrich, recommend users connect to a Wi-Fi network when downloading the app.

One issue that had plagued earlier Siri ports was legality and concerns about copyright infringement. But Chpwn writes that the new app uses a different method to obtain data that makes the app legal. He writes:

Spire uses a new method to obtain the files necessary for Siri, so it doesn’t have the copyright issues encountered by previous attempts. Similarly, rather than directing all traffic through a specific proxy server (and the associated privacy issues), Spire allows you to specify your own proxy server.

Will you give the Spire app a spin on your jailbroken iPhone or iPad?

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