[chaster86]

Just FYI, you do NOT have to root your phone to keep tether functionality. If the Sprint phone ships with, or OTA upgrades to LS670ZVD you can still downgrade back to LS670ZVC using the LG software tool available on their website.

Keep in mind when you do put the LS670ZVC back on your phone it will keep trying to download and prompt you for the LS670ZVD update. All you have to do is let the update pop-up show up, click the 'learn more' button (or something like that, it's been a while I don't remember) and immediately take out the battery. From that point on your phone will not prompt you to upgrade to LS670ZVD. I have been on LS670ZVC for 3 months now using this solution, no issues, and still able to tether with the 'quick settings' app!