A hacker has proven Siri has the potential to work on Apple’s iPhone 4, but its servers are actively rejecting any Siri requests that originate from a phone other than its new iPhone 4S.

iOS aficionado Steven Troughton-Smith has hacked the code to make the Siri voice feature compatible with the iPhone 4. According to Smith, the software runs fairly well, evident in the demonstration video below.

PCMag claim Siri has the potential to work on an iPhone 4, if Apple wanted it to. Siri requires access to server-side software to determine what inquisitions are being yelled into the phone. Since the servers sit on Apple’s end, they verify what kind of phone the request is being made from, and are actively rejecting any Siri requests from any phone other than an iPhone 4S.

Without access to the server, Siri is just a space-wasting application.

With iOS introducing the least amount of innovations yet, Apple are banking that Siri will be a big enough draw for customers to ditch their old iPhone 4 for a slightly different iPhone 4S.