What to do if the microphone isn't working on your Samsung Galaxy S9 (easy steps)
Samsung SM-G965FD Galaxy S9 Plus Duos - Flex Board USB Type-C Connector + Microphone
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Samsung s9 plus microphone not working | Samsung S9 USB port replacement Noor Telecom - YouTube
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SOLVED: Samsung S9 Hardware Layout Including Buttons, Camera, Headphone Jack, Heart Sensor and More | Up & Running Technologies, Tech How To's