iPhone 4S Siri ported to older iPhone 4 handset

Siri, the voice-activated personal assistant that was the centrepiece of Apple's recent iOS 5 launch, and exclusive to the new iPhone 4S smartphone, has been ported to run on the company's older iPhone 4 handset.

The new iPhone 4S looks identical to 2010′s iPhone 4 - but crucially, boasts a 1GHz dual-core A5 chip - which is required, Apple says, in order to handle the complex processing necessary to understand voice commands.

Only now, Apple tech news site 9to5Mac has teamed up with software developer Steven Troughton-Smith to bring the benefits of Siri to the single-core iPhone 4.

Troughton-Smith was able to get the beginning steps of a full port rolling after installing the iPhone 4S Siri and Springboard files onto an iPhone 4. See the video below for a look at how the port works.

The Siri app on the iPhone 4 can recognise spoken commands in both the standard Siri view and the keyboard Dictation view. The only issue at this point is that Apple is not authenticating commands to its servers from iPhone 4 hardware.

You can read full details of the project at 9to5Mac here.