Apps not downloading on iPhone?

So, my iPhone is not downloading anything from the App Store. I press the cloud, or purchase, and nothing happens. It won't even download it if I'm on my computer, syncing it. I'm on an iPhone 4S, and still running ios6.0. I don't want to go to 6.1.3 because I heard battery sucks.

Press it until it downloads or displays an error message.

There could be number of reasons:
http://appletoolbox.com/2012/07/app-not-downloading-installing-stuck-on-waiting-or-loading/

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