In-call audio. When you’re on a call, the Volume buttons control the volume of the other person.
Media. When you’re not on a call, the Volume buttons control media volume during playback or before you listen.
Phone ringtone, notification sounds, and alarms. To adjust these volumes, press a Volume button and then use this shortcut on your home screen:




To silence a ringing phone, press either the Power button or the Volume down button.