There's a small hole beside the charging port on the left side which causes this problem when anything gets put in it or somehow gets in there and blocks the hole. Easy fix is to take a needle or bread tie and put in the hole gently and remove anything in there. Once you do that the people your talking to will be able to hear you speaking loud and clear. It's something that barely happens but does happen none the least. Even if your not experiencing problems with people hearing you talking to them I'd still recommend cleaning the tiny hole. OK that's about it from me for now. Hopes this helps someone.