I've been using my head set a lot recently and noticed if I answer calls, I cannot talk to people because my headset doesn't have a microphone. However I can hear the caller through the head set. I think the thunderbolt thinks I have a microphone on the head set but I don't. Is there a way I can set the phone to where I can speak through the phone's microphone but continue to hear the caller through the headset? I've looked through the settings but I couldn't find anything.