Shortly after the release of the iPhone 4S, it was discovered that the traffic made by Siri can be taken over and transferred to separate setups called Siri proxies that basically allow users to control the responses provided by the personal assistant in iOS 5. The developers of this kind of proxies have offered free the necessary files for their installation and some guys thought they could get some money from those desperate to test Siri on their own terminal. Spire makes it easier for everyone who has a proxy for Siri because the plugin released by chpwn in Cydia allows anyone to connect to a Siri proxy, if they have a server IP available.
As the business seemed to be profitable, various sites began to appear on the Internet asking between $5-$20 per month for access to a proxy for Siri, but do not expect to have the same functionality. Moreover, when you connect to the server, you offer the server owners almost complete access to the information in your terminal: email, contacts, call list, reminders, etc. The bad part is that there are plenty of free proxy servers and I recommend you not to fall into the trap of people who ask for money for something like that because they are just trying to trick you by offering you something that exists for free for money. The situation is identical, with that of the sites that offer for a fee jailbreak solutions already available for free anywhere on the Internet.
In conclusion, if you don't care where your data ends up, don't pay for proxies for Sir, look for a free one. My recommendation is not to use them at all and to wait a few days until the untethered jailbreak solution for iPhone 4S is released and new information about porting Siri to old iDevices will be available.
