Turn off do not disturb
How do I turn off do not disturb on my iPhone when it seems to not want to turn off lolz..!!??
iPhone 5, iOS 10
If Do Not Disturb is on tap to turn off
For iOS10
Turn on Do Not Disturb. Swipe up from the bottom edge of the screen to open Control Center, then tap 
. When Do Not Disturb is on, appears in the status bar.
Even if Do Not Disturb is on, calls and messages from your emergency contacts in Medical ID still come through as usual, and Alarms still sound. If you turned on Emergency Bypass for texts or calls from a contact, those sounds and vibrations come through, too.
Configure Do Not Disturb. Go to Settings > Do Not Disturb.
Above is from: https://help.apple.com/iphone/9/#/iph3dd60e1f