I am using Nokia 6 phone. During call when I put phone on loudspeaker the person I have called can't hear my voice. This problem is with phone app as well as wattsapp and massanger etc. I have tried almost every possible solution suggested by Nokia care centre and what I found on YouTube. After 3 months of purchase loudspeaker also stopped working. Even updated to Oreo but the problem doesn't solved. I took phone Nokia repair centre where the change the hardware i.e multimedia speaker. Now loudspeaker is working but microphone doesn't work with loudspeaker. Please find solution for this problem.