Hello qyakub.
Welcome to Android Forums.
You've come to the right place top learn about your SGS3! Here's the section on AF for it, where the folks that know that phone best should be able to help answer any questions you have.
http://androidforums.com/samsung-galaxy-s3/
If there's anything else we can help you with, just let us know. I hope you'll enjoy your time here.
