For past few months many hackers and jailbreaking experts tried to make Siri work in the devices released before iPhone 4S.
There were various news reports and online videos in this regard. Then came the news that Apple had tried to test Siri with older devices but Siri did not work.
A hacker proved Apple wrong by claiming that most of the Siri features worked in iPhone 4, leaving Apple puzzled. Apple decided to test Siri on iPhone 4 once again. Apple had declared that older Apple devices would not carry Siri.