Issues with calls on S9+

[Android Central Question]

When I call or receive a call for someone, the other person cannot hear me. I've tried with multiple people and they cannot hear me at all unless I switch to speaker or put in a headset. Has anyone else encountered this problem and if so how did you fix it? Mute is off as well..

 

[B. Diddy]

Welcome to Android Central! Does this also happen in Safe Mode? https://support.t-mobile.com/docs/DOC-37190. If so, then the primary phone mic is either blocked (e.g., by your finger, an ill-fitting case, or debris clogging the mic opening) or faulty.