Why is my iPhone saying I have so much storage used?

I'm trying to download iOS7 and it takes 2.9 GB of space. My phone says I'm using 5.7 GB of the space but I have no music, no photos, no videos, and my apps only take up 288 MB. I also deleted all of my messages and and recent calls. Any ideas?

I have a 8gb iphone 4 and I ended up having to delete majority of my apps to get that extra space so you may have to do the same to get that update

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http://www.freeknows.com/iphones/

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