Apple introduced the ability for users to say “Hey Siri” and provide hands-free voice commands to Siri in 2014 with iOS 8. It was limited to basic actions and information queries, but the technology has improved dramatically in the last decade.
How to set up “Hey Siri”
Open the Settings app
Scroll down and select “Siri & Search”
Toggle on “Listen for ‘Hey Siri'”
The procedure is identical for iPhone, iPad, and Apple Watch and their respective Settings apps.
Macs can also listen for “Hey Siri,” but only in models released in 2018 or later for MacBooks and in 2020 or later for iMacs. The toggle is in the same location, but this time in System Preferences.