The headphones that came with the phone...do they have a mic built in? Or is the person's voice going through the headphones and the phone itself picking up my voice? I ask because I thought that the pause/play button on the cord itself was only a play/pause button and nothing else. Caused a awkward situation when my friend called and I was listening to Pandora so I was about to unplug the headphones after answering and I was like "hold on" and he said "okay" in my EAR, so I said "WTF you can hear me?" and he said "Yeah, pretty well". If it uses the phone's built in speaker that'd be awesome because then I can use any headphone combo I want and leave them in all the time if someone calls.