The update also makes both devices compatible with the Samsung Galaxy Gear smartwatch and adds performance and UI improvements along with security enhancements. The update to the Samsung Galaxy S4 brings build number I337MVLUEMK6 to the phone while the new build version for the Samsung Galaxy S4 mini is I257MVLUAMK5.
The update has been arriving to both models OTA and if you haven't received the notification yet, you can try to coax it out of the phone by going to Settings > About > Software Update.
Customers of three big Canadian carriers, Bell, Rogers and Telus, reported this weekend that their Samsung Galaxy S4 and Samsung Galaxy S4 mini handsets are getting updated to Android 4.3. The update for the Samsung Galaxy S4 weighs in at a hefty 790MB and besides Android 4.3, the update also brings Samsung KNOX to both phones. This offers a secure set of applications that are protected from malware and viruses. We're talking about a browser, calendar, contacts and email applications that are in a "secure container" allowing you to use them for work without fear.