Installing IOS 7 on IPhone 4 won't work

I've been trying to figure this out. It's saying that my iPhone is already up to date at 6.3.1.Is it not possible to download the IOS 7 on my iPhone 4?

The Apple servers are very busy catering to many others trying to install the newest iOS.

A simple resolve is to plug in your iPhone 4 to your computer and boot up iTunes. From there, select your device and "Check for Updates". A pop-up window should prompt you to download and install iOS 7.0.

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