Problems with installing new apps on my iPhone?

This started happening about three days ago. I was unable to download any apps that I had never gotten before. I was able to download Netflix because I have used that app but for something like… Fallout Shelter (the app I want to get) I can't download (because I've never gotten it).

I'm logged into iTunes and iCloud so those couldn't be the problem. I have plenty of space left for a game and I'm always connected to internet. I've also tried restarting my phone multiple times but nothing works. My little brother who is using the same Apple ID as me on his iPod is experiencing the same problems.

What Happens:
I go to get an app and I click "Get". It asks me for my Apple ID password and I enter it. The app doesn't load, but the button goes back to "Get" as it once was.

How do I actually fix this problem?

Don't buy iPhones.

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