Hi, if you have tried switching the phone off and removing the battery then putting it back in and switch it on, if you have tried this and it still dont work then this points to the fact that the microphone is damaged in your phone, it wont be a mute problem as you can only mute a call when you are in a call so it wont be something you have pressed, its either liquid damage or the part has just failed, its a common fault and easy to get replaced at most phone shops
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