Had same issue - person on other end could not hear at all over speakerphone. Disabled VoIP. Completely fixed it. S10+ 1TB Sprint. For me, it was under SETTINGS -> CONNECTIONS -> VOICE NETWORKS.
As a side note, not sure what people are complaining about in terms of sound otherwise. I have hearing problems, and this phone is among the loudest and clearest I have ever used. I cannot hear on most phones, especially older iPhones (I has a 4S and 6 plus which were notorious at the time for being among the worst in-call volume of any phone on the market, and the 6 plus was the absolute worst overall phone I have ever owned and caused me to leave apple in disgust for such a buggy half-baked piece of junk. The lost a class-action lawsuit for covering up known issues with it.). The S7 edge had excellent volume and clarity when HD voice kicked in, but it was limited in when it could be used based on what device was being used on the other end. If you are having volume issues on the s10, disable VoIP, disable WiFi calling, and test it over the regular cellular voice. The volume and clarity for me cannot be beat, and the only time I have issues is with specific people due to their poor phone service on the other end.
Thank you to those who posted the VoIP fix earlier in the thread. I was really upset about my purchase until that fix, as I use speakerphone constantly. I do hope they fix this issue, though, as VoIP was a huge deal to me for being able to use data while in a call, and it is absurd to have such a glaring bug in such a pricey flagship phone.
... View more