User manual

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How to turn on the silent mode:
 Swipe down the screen from atop, go to Control Center, and tap
"Mute".
 Tap on the volume button on the side of the phone, Tap at the
lower-left area of the volume button.
More Options for Ringtone Customization
To provide better operational feedback, ColorOS 7.1 offers four
personalized ringtones settings.
Go to [Settings] > [Sound & Vibration] > [System Feedback].
 Dial-Pad Tone