- Apple's 25 year-old concept finally realised in Siri 'intelligent assistant' Among a slew of reports flooding from Apple's iPhone event this evening lies one of their most important announcements in recent years - Siri. Siri is an all-new intelligent voice-control feature in iOS5 and will be available on the forthcoming iPhone 4S. But Siri isn't strictly a new concept at Apple. Siri’s vision was originally devised almost 25 years ago by Apple and was known as Knowledge Navigator.