Use Your Mobile Hotspot 
50
AirCard 790 Mobile Hotspot 
2.  Tap the Home ( ) button.
3.  Tap the WiFi button.
4.  Tap the Options button.
5.  To disable the WiFi signal when you are on a USB tether, tap the WiFi Signal > button.
6.  Slide the ON button to the OFF position.
Your settings are saved.
7.  T
ap the x button.
The WiFi Options screen displays.