Did you ever get your phone quality to improve? Here we are months later...I just upgrade a few weeks ago and have horrible call quality. 
I have used it at home, out of state, in town, out of town, etc. no difference. Have tried all the troubleshooting tips...nothing.
Deciding if it is worth getting an replacement S5 or should I consider another make/model? Just wondering what the outcome of everyone's experience was?
Yes. It is all calls. I have called using speaker, not speaker, other cell
phones as well as landlines. No difference. Have tried to clear the phone's
cache, use HD voice, and have changed different in call settings. Nothing
seems to help. Tried 2 different cases as well as calling without a case.
Still echoing and garbled on my recipient's end.
The phone is brand new. I have it less than a month and the call quality
from what others tell me has never been good. At first I thought it was
maybe the recipient's phone but that doesn't seem to be the case. 
I have full coverage on my phone but was told by other Verizon customers
that since it has been more than 15 days I am stuck with this.
On Jul 27, 2015 6:21 AM, "Verizon Wireless Customer Support" <