For your information, once you have successfully completed the SiriPort certificate installation also have Siri resources (Siriport.ru) installed on your device, you should be able to use Siri. But firstly you need to activate it.
And in this post I would like to elaborate the steps to activate Siri on iPhone 4, so you will be able to use it, and your efforts to install it will not go futile.
1. Activate Siri by navigating to Settings >>> General >>> Siri set to: On.
2. Go to Settings >>> General >>> International >>> Voice Control. There are two sections: Voice Dial Only and Siri, then select Siri and set the language of yours.
3. And then activate the location service. Then go to Settings >>> Location Services >>> Siri set to On.
Hope you find this post helpful! And see you again in another post. !