Poor Sound Quality I phone X

I am experiencing poor sound quality while phone conversations, soon the party on the other side would say "I can't hear you, are your there, you sound like talking from a far, are you are not interested to talk to me etc."

At times through the conversation and between working on a computer I often place the iPhone between my shoulder and my ear then the sound quality is horrible. I have to put the call on speaker phone and lose on the privacy of the call.

I have taken this concern with the customer service department at iPhone and they were of little or no help.

I had recently switched from an Android to iPhone and didn't like the switch.

If anybody know an easy tackle to this problem please share your insights.

Thank you,