Besides Android 4.3 and support for Samsung's smartwatch, the update adds Samsung KNOX to the phone. The so-called "sandbox" is perfect for those who bring their own device to work. It offers a "secure container" with a browser, calendar, email and contacts list. Pressing on the KNOX icon activates the secure security suite. At the end of the business day, press on the icon again and your personal apps become accessible.
The AT&T variant of the Samsung Galaxy S4 is the second carrier branded model of the phone to receive Android 4.3. this month. Just a few short days ago, the update went out to U.S. Cellular customers totin' the current flagship Android phone.