I have set my all of my phone sounds on, but there are no sounds when I receive a text or a phone call. I have checked settings they are all to the max as for sound. But When I tap ringtone, I hear the sound.
Make sure that your ringtone and notification volumes are up. There are 4 (or 3, depending on the ROM) volume settings, and if media volume is all the way up but the others are down you'll hear music and videos but not ringtones or notifications. Turn the volume up when you're on your home page - that should be the ringtone volume. Settings/Device/Sound/Volume will give you all the settings on one screen.
I'm going through diminished volume as well despite settings all up and have ordered a new loud speaker for 6.95. Only 4 screws, click out, click in. How to video on YouTube. Samsung S4