Had the same thing happen between one held-to-my-ear call and the next. Neither the internal nor the external mic worked. I called Cing, checked the mute button, checked mute via software, did what they called a high-level reset (remove battery with the phone on, wait a minute) - nothing worked. I reported it on a Thursday evening, so until the replacement arrived Monday morning I had to use one of my BT headsets.
There is no cause and effect here. BT had nothing to do with it, nor did you do anything. Just get the phone replaced, which you did!
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Alberto
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