Download this app if: you want to share your phone as a mobile Wi-Fi hotspot.
Wifi Hotspot and USB Tether (Pro) by SVTP
This premier app turns your phone into the fastest high-bandwidth Internet hotspot around so you can use your laptop, tablet, or game console online. It also easily enables internet via USB, and it's optimized for the latest lightning-fast 4G...
Tether away — There seems to be a lot of these kinds of apps in the Android Market, but this one works as well as any other.