The following is how to set the vivo phone ringtone:

How to set the system ringtone:

Enter Settings--Sound and Vibration/Sound, Vibration and Mute Keys /Sound--You can set incoming call ringtones, message ringtones, calendar reminder ringtones, notification ringtones, alarm clock ringtones, etc.

How to set custom ringtones:

Enter i Music, long press the selected song in the music playlist, and choose to create a ringtone. (The created ringtones are saved in the "Make Ringtone" folder of file management.) Currently, there are only two formats that support ringtone production: MP3 and WAV.