iPhone and Naughtibod?

Hello all! I have an iPhone and am in a long distance relationship so the OhMiBod highly interests me. I am womdering, however, about the iPhone experience with these vibrators. The Naughtibod in particular catches my attention and I know that it can be used in conjuction with music from the iPhone. I was reading something in the "Press Room" section of this site, however, and it mentioned that the OhMiBod vibrators would also vibrate to the sound of the person's voice. Now, if I had an OhMiBod or a Naughtibod, would it vibrate to the music AS WELL as to a person's voice during a call? Just wondering which one is the best for my iPhone as I'm highly interested in purchasing one (I just can't choose and can't afford two, lol).