The LG G2, is available with 32GB internal memory with approximately 21GB of usable memory.
From the home screen, swipe down from the Notifications bar.
Tap the Settings icon.
Under the General tab, scroll to, then tap Storage.
Available internal memory is displayed under INTERNAL STORAGE.
To free up memory on your device, delete unwanted pictures, music, and videos by tapping Apps > File Manager > Navigate to the desired file > Touch and hold the desired file > Tap to select any additional files > Trash icon > Tap Yes to delete. Note: Photos and videos can also be deleted through the Gallery.
Remove unused apps by tapping Apps > Touch and hold the desired app > Drag the app to REMOVE > Release the app > Tap Yes to remove.
Clear app data by tapping Apps > Settings > Under the General tab, tap Apps > Tap the desired app > Clear data > Yes.
Store your files on the cloud by tapping the Google folder > Drive.