I can't install certain apps to my iphone?

Okay so when I try to install a certain app, I can't because the button you clock is faded. For example I wanted to install a free app, but the app had a faded free button, so when I click it, nothing happens. I tried restarting, logging in and out, resetting all apps, etc. Here is a picture of how it looks.

Check to see if your restrictions are on in settings/general/restrictions! If you turn them off, the apps should then be available to download.

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