Here's a step by step guide how to change the ringtone on Samsung Galaxy S III. I changed the ringtone of the phone when i was bored from the default one. If it happens that you ain't like the default ringtone of your Samsung Galaxy S III and you want to change it, here's a simple steps on how you can change yours too.
First, go to your Phone Settings
To quickly access settings, swipe down from the top of the screen.
That's it! you have now change the Ringtone of your Samsung Galaxy S III