New rumors allege that Apple is working to port Siri back to the iPhone 4. Supposedly corroborating earlier rumors, AppAdvice claimed that Apple briefly let staff get a test build of iOS 5 with Siri on the older model that was pulled once the trial was done. The dry run supposedly went "really well," one tip maintained, supporting recent hacked installs that showed the iPhone 4 and fourth-generation iPod touch capable of handling the voice command system.
