Just a little comment. I have seen many times the so called primary
microphone error of the fairphone2 on the internet. I had the problem
but it had nothing to do with the microphone but with the electric
connection/module to the display module. If you have this problem you
can check whether the mic works fine if you press tightly together the
phone around the microphone module (just call another phone and try it).
If this helps, there is a good chance that the true reason are worn out
plastic parts around. I fixed it by putting a millimeter of tape
underneath the microphone module and before screwing it on again. Now
the module gets pressed a little bit against the display module and
works just fine again (for the moment). Probably the little worn out
outer shell was a part of the problem, I did not have a new one, but
could imagine that buying a new outer shell for the fairphone2 might
rather solve the problem than changing the microphone module. Just try
it yourself before ordering a new microphone.
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