My iphone says the storage is full when it's not.

I have an iphone 5 with 16G. The only thing that takes up space on my iphone is 5.7GB in photos and camera. I don't have any apps, music, movies, or anything. just my photos. Why does it say my storage is over the capacity??? On itunes it says 5.7GB of photos which takes up less than half of my storage, then it says 7.58GB of "other" I have nothing else on my phone. what is all the "other" storage it says i'm taking up??