After the latest update (FP5.UT2K.B.098) callers cannot properly hear my voice. This problem does not occur when I’m using headphones. I also performed a microphone test, that passed. So it’s most likely no hardware problem. Any ideas?
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I don’t think so, but it seems good to ask.
How are you holding your phone whilst calling?
Is there a chance that you are covering the mic wit your hand?
Nope! I’ve been using a phone before! 
And I tried out everything. My impression is really that the problem came up after the system update. I had the finger sensor issue as well, but I could fix that one.
Cannot say for sure, but just today my girlfriend told me my voice was distorted. I don’t do many calls, and that call today was in fact my first call after update. But we’ll see if it persists.
The same problem on my FP 5, latest updates installed. This ist really disappointing.
Regards, stefan