just use
WMWiFiRouter software and all is done automatically for you(3 options for tether 1:USB, 2:WiFI(your phone becomes wireless router), 3: BlueTooth(same as #2 but via BT). Been using this soft for well over 2 years now on different WM devices without a single hiccup or extra charge from carriers(on TMobile and Sprint). Need any further help on it - PM me will try my best to help. And no i am not affiliated with the company