Why can't I make phone calls without a headset or speaker on, plus sound issues in apps?

[Android Central Question]

Yesterday my Samsung s9 plus was uppgraded to Android 9 Pie. After the upgrade, when making an ordinary voice call, I can't hear the other party and they can't hear me. The ring signal works as it should when someone calls me. I can also make calls to others. However, I can't hear them speaking and they can't hear me speaking. But, when I plug in an ordinary headset, I can hear them and they can hear me. Also, if I put them on speaker, I can hear them and they can hear me.

In addition, I can't hear the sound from several apps on the phone without headset, or bluetooth connection. This applies to, at least, YouTube and Spotify.

 

[methodman89]

Assure Bluetooth is off. Clear the cache partition and reboot. Test your microphone by making a short video with sound. Place phone in safe mode if it still is silent. If still not working,, time for a reset or a diagnistic/repair.