If you are using an older Samsung device and wish to upgrade to the latest version of Android KitKat OS, then you need to check this out to know when your device will possibly get the update.
According to a leaked internal Samsung document revealed by SamMobile, the Galaxy S III LTE, Galaxy S4 mini (and S4 mini LTE), Galaxy Grand 2, Galaxy Mega 5.8and Galaxy Mega 6.3 have been confirmed to get the KitKat update.
For users of the Galaxy S3 (GT-I9300), this is sad news because you wont be getting KitKat, due to “unresolved problems”.