How do I use my phone as a wifi network adapter?

You may be able to if you have the usb cable for the phone. Did you look in your phone manual? It should tell you if you can do it or not. Some phones can do it, but t your provider may have blocked it from being used. Like Boost Mobile phones dont allow you to use your data plan to plug it into your computer and surf the web. Finally, Go to your phones manufacturer website and ask the question there.