For those of you who want to wifi tether free on your Sprint Galaxy S3 SPH-L710, here’s how to do it easily on any rooted Sprint Galaxy S3. (Also works on T-Mobile and most Android devices with ICS)
Step 1. Download Wifi Tether for Root Users (Android Wifi Tether App) App from Play Store and run it.
Step 2. Next choose “Change Device-Profile” in Settings.
Step 3. Choose “Generic ICS”.
Step 4. Next you can set your SSID and wifi encryption if you want to.
Step 5. Use your computer or another computer to connect to your Sprint Galaxy S3.