Hi there. My wife's S4 recently developed a problem where the volume is barely audible while on a call, even when completely maxed. All other sound profiles seem just fine. I thought at the very least I could fix it by Factory Resetting the phone, but it hasn't solved the problem. Any help or suggestions would be appreciated!
Very annoying issue to have. I've been looking for solutions this morning.
One thing I found was to go to your settings, and then go to "volume", and lower and raise all of the sliders. Then, turn the volume up and down using the hardware buttons on the side of the device. Some people said this had a sort of "reset" affect on the volume.
Somebody else suggested pressing your volume key in the middle (between up and down) and then sliding it up.
Also, try removing the battery for five minutes.
Let me know if any of these fix it, I'll keep my eyes open for other possible solutions.