Can I use the Siri assistant on the iPhone 4 / iPhone 3GS?
Apple is launching Siri, a voice assistant integrated into iOS 5 they claim will change how people interact with smartphones forever. Those with an iPhone 3GS or iPhone 4 can update to iOS 5 however don't look for Siri on these devices.
Siri will be an exclusive feature only found on the iPhone 4S.
It is likely, however, that the iPhone jailbreak community will come up with a mod that will allow Siri to be used on the iPhone 4, and perhaps even on the iPhone 3GS.