It’s been a long time coming for a proper legal Siri port for older devices like the iPhone 4, iPhone 3gs, iPod Touch and iPad 1 & 2. The developers behind this new programed call Spire are Grant Paul(Chpwn), Steven Troughton and Ryan Pertrich.
The thing about this port is that it is complicated to set up, But is fully legal to use and doesn’t infringe on Apples copyright in anyway. The downside is that you will need to set up your own proxy and will need and iPhone 4s temporarily to get Spire up and running.
The program is ready for download in Cydia right now and is 100MB in size as it downloads the siri file directly from Apple. Check out the source link below for more information.
Source: Chpwn Blog