iPhone User Guide
- Welcome
- What’s new in iOS 12
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- Wake and unlock
- Learn basic gestures
- Learn gestures for iPhone X and later
- Use 3D Touch for previews and shortcuts
- Explore the Home screen and apps
- Change the settings
- Take a screenshot
- Adjust the volume
- Change the sounds and vibrations
- Search for content
- Use and customize Control Center
- View and organize Today View
- Access features from the Lock screen
- Travel with iPhone
- Set screen time, allowances, and limits
- Sync iPhone using iTunes
- Charge and monitor the battery
- Learn the meaning of the status icons
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- Accessories included with iPhone
- Connect Bluetooth devices
- Stream audio and video to other devices
- Control audio on multiple devices
- AirPrint
- Use Apple EarPods
- Apple Watch
- Use Magic Keyboard
- Wireless charging
- Handoff
- Use Universal Clipboard
- Make and receive Wi-Fi calls
- Use iPhone as a Wi-Fi hotspot
- Share your iPhone Internet connection
- Transfer files with iTunes
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- Get started with accessibility features
- Accessibility shortcuts
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- Turn on and practice VoiceOver
- Change your VoiceOver settings
- Learn VoiceOver gestures
- Operate iPhone using VoiceOver gestures
- Control VoiceOver using the rotor
- Use the onscreen keyboard
- Write with your finger
- Control VoiceOver with Magic Keyboard
- Type onscreen braille using VoiceOver
- Use a braille display
- Use VoiceOver in apps
- Speak selection, speak screen, typing feedback
- Zoom in on the screen
- Magnifier
- Display settings
- Face ID and attention
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- Guided Access
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- Important safety information
- Important handling information
- Get information about your iPhone
- View or change cellular settings
- Learn more about iPhone software and service
- FCC compliance statement
- ISED Canada compliance statement
- Class 1 Laser information
- Apple and the environment
- Disposal and recycling information
- Copyright
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.