I have an iPhone 3GS, and I want to know if it is possible to install Siri on it.
It is not possible to install Siri. The iPhone 4S is the only iPhone that includes this system-wide functionality. You may have read about the Siri app, which is what the Siri team originally developed before their company was acquired by Apple. This app was available for older iPhohe models. However, when the iPhone 4S was released, the Siri app was discontinued. Hope this helps.
Actually it is possible, but you have to jailbreak your 3GS first. I found this article on your iPhone 4 and 3GS.
It looks like you need:
- Jail broken iOS 5 device
- OpenSSH and iFile from Cydia
- SFTP client ( CyberDuck for Mac OS X and WinSCP for Windows)
- Extracted Siri files from iPhone 4S
More info on the link.
This isn't a very reputable website, but it shows the Tweets that iPhone hacker Musclenerd posted about his findings with iOS 5.0.1. It turns out that Apple tweaked it, and removed the encryption used on the locations where Siri is stored (essentially meaning that it's now legal to port Siri to other devices).
Musclenerd on Twitter is the best person to watch for information about Siri on anything other than the iPhone 4S. It should be possible in the coming weeks, or months to do such a thing.
Just watch this space.