I have no space on my iPhone 4s?

So I've had my iPhone 4s for about a year now and I have 1.5GB left. My phone only has 13.2GB on it. I went to my settings and went to usage and added up all the MB and it only comes up to about 2GB of space that I'm using. I've heard the new update i.O.S.7 takes up 3 GB of space (don't know if that's true) but even then that would only be 5GB being used. Does anyone have any explanation as to why i have no space on my phone?

Not an astronomy question. Please ask elsewhere

If you can't work a simple internet forum and follow its instructions, you won't be able to work a smartphone. Look at which section your question defaulted to because of your use of the word "space".

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