Open Settings
Tap Siri & Search
Turn off Listen for “Hey Siri” or “Siri”
Turn off Press Side Button for Siri
Turn off Allow Siri When Locked
If prompted, confirm Turn Off Siri
To disable Siri suggestions, turn off Suggestions in Search, Suggestions in Look Up, and Suggestions on Lock Screen
To remove Siri completely from Apple Intelligence settings, open Settings, tap Apple Intelligence & Siri, then turn off Siri options if available