I just realized that I hadn't covered voice commands in Windows Phone 8! So here is a list that covers the basic functionality so you don't have to use your keyboard so often. Especially if you want to call someone. You can call by name or phone number.
In addition you can launch any app that you have loaded to your phone. All you need to know is the name of the app. Some even have commands built in so you can call the app and give it a command all in one step.