i think i posted a similar topic in another forum a while back but it got lost somewhere. Premise: So lets take iPod. by show of hands, how many use the original ipod headphones? ok i see no hands... lets just say 50% of you. by show of hands how many use Bose or Sony or other headphones? k the rest of you. My point is i dont plan on using the iPhone headset to listen to music.....AND in my car I use an iPod USB connector thats wired to my car radio. I'm sure there are many many others that do the same with their iPods. So since im probably not going to be lugging around an iPod and an iPhone, that would defeat the purpose of a 3 in one device, what happens when i get a call? Most standard headphones use a 1.8mm jack that is for audio in one direction only. from the unit to your ears. Most cellphone headsets (two directional devices) are of a particular size and fit made for that particular phone. and if you attempt to plug in a regular headphone set to said unique cell phone jack, odd things happen. No audio, sometimes no voice etc. So i guess my question, and concern is if I have other-than-apple headset plugged into my iPhone will i be able to speak to the caller during a call? Or if i have the iPhone plugged via USB to a device such as my car radio will I be able to speak through the iPhone? Will the callers voice be amplified ,rather unnecessarily, through 4 12" subwoofers ( i hope not ) I'm obviously not expecting anyone to know for sure regarding a product not shipped. But if anyone has any insight to how this issue in general, enlighten me please.