User manual

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Customize the Ringtones
ColorOS 7.1 enables the user to customize ringtones. You can set
different ringtones to identify incoming calls, messages, and calendar
notifications. You may also customize the ringtones by importing alert
files on your phone or from online sources.
Go to [Settings] > [Sound & Vibration].
Silent Mode
You can turn on the silent mode if you're not hearing or seeing incoming
calls and alerts when you expect.