I have an 06 ..... there is a button on the steering wheel that I press, and the car beeps thru the radio speakers. You can say HELP and it lists the available commands. You can say CALL NAME, then it says Who do you want to call? if you have store any names, you could say HOME ...
You can say Dial number - and then say the #'s ... this one is a tad tricky especially if you driving - due to back ground noise.
Try saying HELP and then play with it. I did not find any documentation on it, but HELP handled most of my questions. The only thing I get confused about is something when you press that steering button, it dials the last # called. It seem you should hold the button in till you hear a BEEP.