I am experiencing the same problem..my s7 edge mic does not work with speakerphone calls or voice calls..Although i bought it refurbished from China, I am still very upset because I didn't pay a little bit of money for it..it was quite expensive. And when i 1st got the phone it got locked with FRP. I had to pay additional money towards it to get it unlocked because i gave up trying to unlock it myself after spending 4 or 5 hours late at night till 3 AM. I'm not sure what the cause was, but i think it was because I signed into my samsung account on my phone.it came unlocked already without me having to go through the initial setup process after factory reset...i am displeased as well with this phone..i know Samsung to be better than Apple but I'm having 2nd thoughts now.
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