IPhone 6 phone not vibrating or going off when I get a notification?

I can get a text but I won't know when until I actually open the app. My phone won't vibrate or make sound and not even the little red button will show on the messaging app to let me know I have a message. I also can't install IOS 9.3.1 it won't let me

Reset it

Check to see if you accidentally put on the night/do not disturb setting

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