The international version of the 16GB Samsung Galaxy S4 has about 9.5GB available for users. On models available through U.S. carriers, that figure is less than 9GB. While the phone does offer a microSD slot, not all apps can be installed on a microSD card. And if you're asking what Sammy did with the unavailable storage, just think about all of the features on the device. While fans of the phone consider them "cool," others have called features like Air View and Smart Pause "gimmicky". The former allows you to hover your finger above the display to open email messages without touching the screen, while the latter stops a video as soon as your eyes move away from the screen, restarting it where you left off once your eyes return to the display.
BBC Watchdog will be shown on BBC1 at 8PM (GMT) on Wednesday May 15th.