Why can people hear me on call?
Not all the time, but when I make or receive calls people on the other end cannot hear me.
I found that during a call if I tap on the back of the phone everything starts working.
Using earbuds and no problems.
What do I need to fix?
Is dit een goede vraag?
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4 
I currently have this problem too and found the answer. The problem is that some of the circuits in the logic board arnt making a good connection (possibly due from a drop). Some people found problem solved by putting a piece of paper semi thick paper to press down on it.
door Alan Perez
Alan Perez, which circuit and where do you place the paper?
door oldturkey03