I was messing around on Kelly Blue Book to see what the private party value of my ride is (not that I'm considering selling, I was just bored!!!), and saw the option for the integrated phone. What exactly is this and is it a factory option or what? I've noticed the small speaker grill looking holes down by the steering column, but I wasnt sure if that had something to do with it or if that was just for the OnStar. Just curious, any insight is greatly appreciated. Thanks.