If you are using a vivo phone, you can refer to the following methods:

How to set the system ringtone:

Enter Settings--Sound and Vibration/Sound, Vibration With mute key/sound--you can set incoming call ringtones, message ringtones, calendar reminder ringtones, notification ringtones, alarm clock ringtones, etc.

How to set custom ringtones:

1. Enter Settings--Sound and Vibration/Sound, Vibration and Mute Key/Sound--Incoming Call Ringtone--Custom Ringtone, select local Songs, you can also click Clip in the upper right corner after selecting a song to freely intercept song fragments and set them as incoming call ringtones.

2. Enter i Music, select the song in the music playlist--click "..."--select the ringtone--after intercepting the clip--set as ringtone. The formats currently supported for ringtone production are: MP3 and WAV. Paid or membership songs do not currently support setting ringtones (made ringtones are saved in the "Make Ringtone" folder in file management)