Muting/unmuting the microphone
You can mute and unmute your phone’s microphone while a call is in
progress. When your microphone is muted, you can still hear the other caller.
1. Press Options.
2. Scroll to Mute, then press Select.
3. To unmute the microphone, press Unmute.
4. Muting and unmuting also affects the microphones of any accessories
connected to the phone.