I think that you can only mute / unmute it. Other than that, you cannot adjust it's sensitivity audio bandwidth or directionality. . During a call, you can mute the microphone by pressing MENU > Mute to turn microphone on or off. . You can download a user guide as a .pdf file from: . http://funadvice.com/r/14rbs1e73pd . You can then search the manual rapidly using [ Ctrl+F ] then entering "microphone". . Best wishes - Majikthise. .
Ur best bet it look at the book that came with the phone