Learn how to ringtone on your HTC One Max.
Do one of the following:
To change from silent to normal mode, press the VOLUME UP button.
To change from vibrate to normal mode, press the VOLUME UP button twice.
Go to Settings, and then tap Sound > Sound profile.
HTC One max has a quiet ring feature that automatically lowers the ring volume when you move it.
Go to Settings, and then tap Sound.
Select the Quiet ring on pickup option.
To help avoid missing incoming calls when HTC One max is in your pocket or bag, the pocket mode feature gradually increases the ring volume and vibrates when you receive a call.
Go to Settings, and then tap Sound.
Select the Pocket mode option.