Silence Do Not Disturb so you stop missing calls, texts, and notifications.
Swipe down from the top-right corner of the screen (iPhone X or later) or swipe up from the bottom (iPhone SE / iPhone 8 or earlier).
It looks like a crescent moon icon. If Do Not Disturb is active, it will be highlighted.
The moon icon will dim and notifications will resume immediately.
The first swipe shows notifications; the second swipe reveals the full tile grid.
It typically shows a minus sign inside a circle. If it is active, the tile will be highlighted or colored.
The tile should no longer be highlighted. Notifications, calls, and messages will come through normally.