Open the Settings app
Tap Siri & Search
Turn on Listen for “Hey Siri” or Listen for “Siri”
Turn on Press Side Button for Siri
Turn on Allow Siri When Locked
Follow the on-screen setup prompts
Make sure your iPhone is connected to the internet
Make sure your iPhone supports Siri
Update iPhone to the latest iOS version if needed
If Siri is unavailable, check Screen Time restrictions
If Siri still does not work, restart your iPhone