Is it possible to install siri on iphone 3gs?
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.