Chosen Solution

My phone was repaired about two months ago and it worked fine for about a week. The problem I have now is that when I make or receive a call I can hear the person on the other end, but they cannot hear me. If it is connected to the Bluetooth in my car they can hear me fine.

Hmmm. Maybe when you reassembled it, a wire was not snug. since the issue only appeared a week after, I’m going to say most likely a wire has wiggled itself loose.