Trying to install iOS 7 on my iPhone 4?

So, just recently the iOS 7 came and I was excited. So I tried to downloaded it, but I need to delete some stuff in the usage settings. So I delete like I don't know like 2.9 GB out of it, but still it won't let me download. I have deleted all my apps and some of my pictures and videos, but still.

Get in a Wi-Fi zone. Or just delete some more stuff

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