Why does the volume of my ringtone sometimes become the maximum by itself? It's clearly set, but it's not set to the loudest. Just jump when the phone comes.

If you use a vivo phone, the ringtone will automatically become louder because:

1. You go to Settings-Sound (and Vibration)-and turn on "The ringing of incoming calls is getting louder and louder". If you don't need this function, just turn it off.

2. When there is an incoming call on the mobile phone, if you don't answer the phone for 30 seconds, the ringtone will be automatically amplified to avoid missing the incoming call because you didn't hear the ringtone.