The Samsung Galaxy S4 Active is available with 16GB internal memory, with the option to add a microSD card up to 64GB.
From the home screen, swipe down from the Notification bar.
Tap the Settings icon.
Tap the MORE tab, then tap Storage.
The device storage summary will be displayed beneath Device memory.
Scroll down to view the memory card storage info, listed beneath SD card.
To free up memory on your device, delete unwanted pictures, music, and videos by tapping Apps > My Files > Desired category > Desired folder > Desired image(s) > Delete icon > OK.
Remove unused apps by tapping Apps > Touch and hold the desired app > Drag to the Uninstall icon > UNINSTALL.
Clear app data by tapping Apps > Settings > MORE > Application manager > Desired app > CLEAR DATA or CLEAR CACHE.
Download a cloud storage app by tapping Play Store > Search icon > Enter the desired cloud storage app > Desired selection > INSTALL > ACCEPT > OPEN.
Purchase an SD memory card to expand your device memory.