My 16GB Iphone 5 only has 11.7GB?

On my Iphone 5s thats supposed to have 16GB only says it has 11.6 GB in storage.
I'm currently on IOS9 and its been this way since I got my phone. Currently I have all my space used up (0 GB available, 11.6 used) Is there a way to get the other 4.4 GB?

The rest of the storage is used up primarily by iOS, so you only have 11.6 GB to use for other stuff with iOS 9. There's no way to get back the other part of it.

Yeah thats normal

No. That's for iOS itself.

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