My iPhone 4 won't let me download certain apps from the App Store?

My Iphone 4 won't let me download some apps from the App Store nothing wrong with the billing information or anything but it shows that it is free on the little box and it won't let me press it. I have deleted some apps from my phone just in case it was a problem with the space left on my phone but nothing has worked. If you can help thanks.

If it is a game that uses a lot of processing power then the phone may be too weak to play the game. Or it might be because of your OS, do you run the latest version of iOS 6?
Apple makes new iPhones every year and people say they are the same, but now there are apps for the iPhone 5 and iPad 4th gen. That uses a lot more processing power than the iPhone 4 even has.
You are probably unable to download it because your phone is too weak. Or your OS is outdated.
Here is a chart of the iPhone/iPad/iPod processing power:
http://browser.primatelabs.com/ios-benchmarks
iPhone 5s is released soon, maybe it is time for an upgrade.

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