I am having similar issue... Galaxy S7 pairs with unit fine and I can hear everyone calling. They cannot hear me however. I believe it may be a Bluetooth issue with newer Bluetooth version on the phone???? Any help is appreciated. I've tried on a few phones in my house and when I pair a new one, the person calling me the first time hears me respond HELLO, but then the unit sort of "pops" a sound out and then they cannot hear me anymore.