Rooting your android phone, such as a Samsung Galaxy S3 GT-i9300, can be beneficial. A root can allow the phone user to use apps like Titanium Backup in order to restore and backup your phones apps and data. Rooting your phone can allow you access to settings and customizations you would normally not be able to get right out of the box. Rooting your S3 is completely safe. You should make sure you know what you are doing beforehand though. One of the most popular reason for rooting is to be able to use custom ROMs, that differ from what the phone manufacture has installed.
This guide can be used to root a Galaxy S3 GT-i9300. This guide is for international models only. Do not attempt to root a Canadian GS3 using this guide.
Turn your Galaxy S3 off
Activate the “custom OS” warning message by holding VOLUME DOWN, HOME KEY, and POWER button simultaneously.
Press the VOLUME UP button to activate “download ODIN” mode. You can now connect your Galaxy S3 to your computer using a USB cable.
Download the appropriate root files called “GalaxyS3RootNew.zip” You can find the download here. After downloading “GalaxyS3RootNew.zip” decompress the file, and execute the file named “odin3v1.85.exe”
You should see a yellow box in the ODIN application window. The yellow box contains a COM number. If you do not see a COM number, then you will need to download and install these Samsung USB drivers.
Click the button named “PDA” and then find and select the file named “CF-Root-SGS3-v6.4.tar.” Do not change any other settings before clicking this file.
Now click the “Start” button to begin the installation of ClockworkMod Recovery on your Galaxy S3 device.
The ODIN application will signal that it has completed flashing by showing “PASS” in a green box.
The Galaxy S3 automatically will reboot as soon as it is into ClockworkMod Recovery. It will then begin to install the root and Superuser application. You will find an application named “SuperSU” after the phone has rebooted.
Test whether or not you have rooted your phone using an application like “Titanium Backup” app. You should see a Superuser request window.
It would be a good idea at this point to make a backup of you ROMs.