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Can I Set my Samsung Galaxy S® III to Automatically Increase the Volume when it is in my Pocket or Purse?
You can set your device to automatically increase the volume when it is in your pocket or purse.
Increase Ringing Volume in Your Pocket or Purse
Open the Phone application, and touch Menu > Call settings > Increase volume in pocket. When the feature is on, a green check mark will appear. The device will increase its ringtone volume when you are carrying it in your pocket or a purse or bag.
Note: You can also access Call settings from the Home screen. Touch Menu > Settings > My device > Call .