App Store won't allow me to download certain apps?

I have an iPhone 4 which has restrictions on it. I can't get into them. I don't know if the restrictions have anything to do with the fact that I can't download certain apps. As in, the buttons that you click to install the apps are grey; you can't click on them. The only apps I can't download are KiK (which I'm not allowed to have), and any app that has to do with music (besides iTunes). How do I fix this? Or hack into the restrictions?

My phone does this when my phone isn't compatible with the app software

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