Can't download iOS 7 on my iphone 4?

I have a 8gb iphone 4.It is compatible with iOS 7, I just don't know how to clear up storage. I tried to delete all of my apps but it didn't work. I have 2.8 gb free but I need 3.7. How can I free up more storage?

Here is a page that can help you clear up storage for iOS 7:)

http://www.foxnews.com/...e-is-full/

Don't get iOS 7 on your iPhone 4 unless you want terribly slow performance on it.