Hey there, and welcome to Apple Support Communities, faatamalii!
From our understanding, you’re unable to hear when on a call and the person you’re calling is unable to hear you. You also need to know more about noise cancellation. We can certainly understand your concern and can help provide some insight.
We see you recently reviewed “Customize headphone audio levels on your iPhone or iPad”. That is a great place to start.
Does this only happen when on a call? Does the sound work as expected when listening to audio or when using FaceTime? Also, are you able to hear the call if you connect headphones?
We look forward to hearing from you.