How to WIFI tether on the LG Optimus F3 (t-mobile version)
1. Root your LG Optimus F3
a. Enable USB debugging on your phone.
b. Download motochopper.
c. Extract motochopper.zip
d. Run run.bat(for windows users) or run.sh(for linux be sure to chmod 755)
d.1 If you have a tether app open in windows CLOSE IT!
2. Install Root Browser on your LG Optimus F3
3. Run /system/etc/disable_tmus_vendor_apks.sh (I suspect you can find a similar disable script for other carriers in the same location with the same disable_ prefix.)
a. Open Root Browser.
b. Allow root browser to get busybox/etc. for you
c. Open system
d. Open etc
e. Tap disable_tmus_vendor_apks.sh
f. Run it!
4.1 Install JB WiFi Tether on your LG Optimus F3
4.2 OPTIONAL Go into your stock wifi tether app and configure your wifi hotspot settings.
5. Run JB WiFi Tether.
You should now have upsell free wifi tethering.