iPhone X My att iPhone X phone calls keep cutting

[ovo6]

For the past couple months my when I talk to people my voice keep cutting. I can hear the person in the other line fine , I have unlimited plan and I’ve reseted the phone as new and try changing some setting I seen online and nothing . Could it be the antenna or SIM card . Has anybody else experiencing this

 

[now i see it]

Try using the speakerphone instead.
I've got a 6 Plus that does the same thing, but is fine when using the speakerphone. If you've got a fringe connection, most phones will cut out intermittently