How to root Samsung galaxy s3(GT-I9300)? Many galaxy s3 users asked this question. Since rooting galaxy s3 can add many fancy things to it, including custom ROMs, download apps which not offered by Google play, make operating system and so on. They need these rooting advantages to inject a new life to their old friend. However, rooting galaxy s3 also comes with the safety risks, so it is necessary to know about the risks, and get ready before s3 root.