Samsung Galaxy S 4 Manual page 20

Smartphone "Facts of Life" 3
Second, each carrier has its own method of updating the phone's
operating system and apps. To be applicable to every carrier's S 4, this
book explains how to use the software that all S 4's have in common;
little mention is made about carrier-specific apps and updating
procedures. For such information, you should refer to the carrier's online
manual and support.
• App and operating system (OS) updates can be delivered or downloaded
whenever the app developers and your carrier, respectively, see fit.
Thus, like all Android cell phones, the S 4 is a moving target and subject
to change. This book, on the other hand, is static text—correct at the
time it was written. When a new version of the OS is applied to your
phone, the steps to perform some procedures, what you see onscreen,
and the options available in certain Settings categories may change
slightly. However, based on past OS updates, even if this happens to an
app here or a procedure there, the material in this book should still be
sufficiently relevant for you to determine how to work with and use the
new features and options. In other words, you're still far better off with
this book in your hands than without it!