With iOS 17, Siri by default still responds to “Hey Siri” but users can now also say simply, “Siri.” However, users can adjust this so that Siri responds to only “Hey Siri” or you can even turn off ...

First, you'll have to set up Vocal Shortcuts on your iPhone. Go to the Settings app, then Accessibility, then scroll until you find Vocal Shortcuts. Once you're there, select "Set Up Vocal Shortcuts" ...