The update is available via Samsung Kies desktop software
The long-awaited Android 4.1.1 Jelly Bean update for Samsung Galaxy S III has just arrived at AT&T. Keep in mind that the upgrade is only available via Samsung Kies desktop software.According to XDA Developers, the Jelly Bean update file is about 738MB in size, so it might take a while to download and install it.
Aside from bringing the phone's software to Android 4.1.1 Jelly Bean, the update adds Google Now and a new keyboard.
Other improvements to the camera are included as well, such as new filters (warm vintage, cold vintage, black and white, sepia), pause and resume recording, as well as low light mode (uses HDR).
With the latest update, the phone supports AllShare Cast Wireless Hub and NFC (Near Field Communications) One Touch Pairing. It also adds Easy and Blocking Mode.