Make sure you didn't put a screen protector over top of the little speaker. It looks like a little (1/6 in ch wide), gray horizontal slot, just above where the Kyocera label is.. I found this page, when all I had to do, was physically look at the speaker itself on my phone. I had just put on a screen protector and didn't realize i forgot to cut the speaker portion of it out before installing. Extremely silly fix BUT indeed a fix, if there's some physical ANYTHING blocking the speaker slot.