Siri launches on iPhone 4S (2011)
Apple shipped Siri on the iPhone 4S, putting a voice assistant in hundreds of millions of pockets. The assistant set reminders, answered questions, and sent texts using natural language, with no visual presence.
Voice became the first mainstream AI interface, and competitors including Google Now, Cortana, and Alexa followed within years.
Siri established the pattern of talking to machines that persists today, though the 2011 version lacked real-time conversation and visual feedback.
Live Avatar extends the same interface leap Siri made mainstream, adding a visible, expressive face to what was previously a voice-only interaction.
