I have the Samsung Conquer 4g with Sprint. My head phones work great for music, however when I receive or make a call I am muted... well, the other person cannot hear me, I can hear them fine. When I unplug the person can hear me. The phone never gets the headphone icon up in the task bar.
I also have the HTC Evo 3D, and this works fine. When I plug in my headphones i see the headphone icon, and can make calls no problem.
Is this a limitation in the Samsung, defective? A bug?