Siri is the latest intelligent assistant for iPhone 4S. Too bad that Apple does not enable Siri on old generation iPhone 4 or iPhone 3S. It is just an application, right? Anyway, I am not going to get iPhone 4S anytime soon and will wait for iPhone 5 instead. And I do want to try out virtual intelligent assistant on smartphone. Speaktoit Assistant and Vlingo Virtual Assistant are the virtual intelligent assistant application that I tried so far. There is few more in Android Market now. Try all of them if you like…