Since Samsung has already released the source code for the AT&T, Sprint and T-Mobile versions of it’s flagship new device, the Samsung Galaxy S III, it was honestly only a matter of time before these got rooted. Most of you who have already purchased or are going to purchase any model of this device will undoubtedly be immensely please to know that all three variants have been successfully rooted by the guys at XDA Developers. Samsung has made the device available on all major US carriers at around the same time and although some people are still waiting to be able to get their hands on it, props to the developers for getting the devices rooted so fast.
Surprisingly enough, the root method for the Sprint variant turned out to be identical to the method for T-Mobile. Some have suggested that the same method may work for AT&T model as well, but for now it is best to stick to methods confirmed working. The only difference between the root methods are the files used.
The process is what most of you will be familiar with and what is now typical for rooting most Samsung devices. The latest version of Odin will be needed to flash both the kernel and ClockworkMod Recovery onto the device. After this you will simply be required to use ClockworkMod Recovery to flash root.
The method is easy enough and you should be able to successfully root your devices, even if you are a beginner. Links to the original threads containing instructions for the method in great detail are given below so you should not face any problems whatsoever. Follow the instructions for your specific model.
Before you begin following the instructions, remember to backup all your data. Also keep in mind that rooting usually voids your phone’s warranty.