I have a set of $100 Sony earbuds that I tried with my MT4G when I first got it, and they sound really great, but I really wish I could use them to have hands free phone calls, like I can with the factory set of earbuds. Problem is those ones sound really... not great. Do any companies like Sony or Sennheiser make a better set of headphones with at least a mic, that is compatible with our phones? How standard is the design of the factory earbuds as far as the way they pass signals to phone (how inter-compatible are these)? Are all HTC headphones designed this way, or just the MT4G? Or pretty much all smartphones? Will a set designed for an iPhone work (I feel dirty now)?