I got some iPhone headphone + mic knockoff, and it doesn't seem to work. The headphones work fine, but the mic doesn't provide any input. Cant record, cant talk on Skype, Skype doesn't even recognize I have a mic attached. Now, the set only cost me like 3 bucks, so I don't really mind trashing them, but could it be I'm just not doing something right? Are there any modifications required, or is it really just plugging it in?