From March 20, 2016 until just now, March 30, 2016, my App store was not working.
If you are having the same trouble with you iPhone 6 App Store, follow the steps below.
How to fix the iPhone 6 App Store.
1) Go to “Settings”
2) Tap on “Touch ID & Passcode”
3) Enter your passcode (if required)
4) Turn OFF the following options:
“Apple Pay” & “iTunes & App Store”
For whatever reason those options broke my iPhone 6 App Store.
As soon as I turned them off my iPhone 6 App Store re-appeared.
I hope this helps someone.