Change Siri settings on iPhone
Change Siri settings
Go to Settings > Siri & Search, then do any of the following:
Change the voice for Siri: (not available in all languages) Tap Siri Voice, then choose a male or female voice for Siri or change the accent.
Prevent Siri from responding to the voice command “Hey Siri”: Turn off Listen for “Hey Siri.”
Prevent Siri from responding to the Side or Home button: Turn off Press Side Button for Siri (iPhone X and later) or Press Home for Siri (other models).
Change the language Siri responds to: Tap Language.
Limit when Siri provides voice feedback: If you don’t want Siri to always provide voice feedback, tap Voice Feedback, then choose an option.
Prevent access to Siri when iPhone is locked: Turn off Allow Siri When Locked.
Turn off Search & Siri suggestions: Turn off any of the following: Suggestions in Search; Suggestions in Lookup; Suggestions on Lock Screen; and for a specific app, tap the app, then turn off Search, Suggestions & Shortcuts.
Adjust the Siri voice volume
Use the volume buttons. See Adjust the volume on iPhone.