The Galaxy S3 allows you to adjust pretty much every setting you can think of
The Samsung Galaxy S III (S3) is one of the most configurable phones available. The good news is that you really don’t have to do anything out of the box and your Galaxy S3 will work fine. But one area that can really be tailored to your personal tastes is in perhaps the most important of all apps -- the Phone app.
The Phone app is one of the more robust apps on the Galaxy S3. The Call settings allow you to adjust everything from a call rejection list a personalized EQ setting for better audibility.