Here is a tutorial to install Siri to your iPhone 4 or iPod touch 4G using SiriPort, and the good news is you don’t need to have Siri proxy for authentication requirement.
Unlike Spire that requires you to have proxy, with SiriPort — once you installed its package — you can then activate Siri instantly and no need proxy during the process. So let’s get into the steps.
Install SiriPort on iPhone 4.
1. Firstly jailbreak your iPhone 4 or iPod touch 4G.
2. Open Cydia via your device, then navigate to Manage to Source to Edit and then add the following URL Source – followed with click Add source:
repo.siriport.ru

3. After you’ve finished with the above step, now you need an iPhone 4 certificate. To get it, open this web url: siriport.ru/1.crt using phone’s browser of yours. If you fail to open it. You can use your PC browser to download the certificate and use your iPhone 4 email you configured and and open the email to download the certificate.
4. Now launch Cydia again, then navigate to Manage > Source > Edit.

5. And then tap on Add, then this url repo.siriport.ru followed with Add Source clicking.

5. You will likely see “verification error” message like this.

Check your Wifi connection and then enable it, to download SiriPort and avoid the verification error. Then siriport will be installed automatically. Afterward reboot your phone.
6. For the third time launch Cydia and then Manage and tap Source, find SiriPort.Ru Repository in the list.

7. Touch the SiriPort.Ru repository, when you are inside the repo, then find SiriPort.

8. Install it.

9. Your device will begin the installation, it may take sometimes, once the installation completed. Reboot your iPhone.
Congratulation you have fully installed Siri on iPhone 4 or iPod touch 4G using SiriPort without Proxy requirement. And you can continue on how to enable Siri on iPhone 4 guide.
