Use the Storage menu to monitor the used and available space in your phone.
INTERNAL STORAGE
Total space: Displays the total amount of space in the phone’s memory. It’s listed in Gigabytes and also on a colored bar graph with a colorcoordinated list of the apps as well as the amount of space they use. Remaining memory space is gray.
SD CARD
Total space: Displays the total amount of your external memory.
Available: Displays the amount of space available in your external memory.
Mount/Unmount SD card: Allows your phone to recognize your microSD card and release it to safely remove your microSD card.
Erase SD card: Erases all of the data stored on your microSD card.
Save to SD card in Camera: Checkmark to save images you take using the Camera app to your microSD card instead of your phone's internal memory.
Tap the Menu icon (at the upper-right corner of the Storage screen) to access Display in MB (or GB).