How to check the Device Used Storage space in Samsung Galaxy S3(GT-I9300) JB OS 4.3?

a). Tap on Apps icon as shown below.

b). Now, Tap and drag the Application screen towards right and then tap on Settings icon.

c). Now, tap on More settings as shown below.

d). Now, tap on Storage option as shown below.

e). Now, tap on Used space as shown below and then the list will appear which displays the Used Phone memory space under various applications and functions.