I've got some questions for iPhone's owners regarding headphones support. I've heard that the jack plug is a little weird and doesn't support all types of headphones.... so here we go: 1) Are headphones like Koss Porta Pro supported? I use this a lot for my iPod, would be dissappointing if it doesn't work. If not, what do you use yourself? Is the quality of the included ones any good? 2) How do you handle incoming calls when headphones are plugged in (not the included ones)? Obviously you can't talk thorugh them, unless they have a microphone, but do you have to unplugg them every time in order to get sound in/out of the iPhone and make it work like a "normal" phone? 3) Can you have the incoming sound through your headphones and speak into the iPhone mic when using headphones without a mic (unlike the included ones)? I know it would look kinda silly, like holding a walkie-talkie, but at least you can keep the headphones on. Tanks for your answers, and sorry if this has been asked before. It's just kind of important to me before finally ordering an iPhone, as good sound quality really matters to me, as well as being able to answer calls easilly - if not, I may as well just use my iPod and phone separately.