Silence calls, alerts, and notifications while your device is locked and schedule a time or choose who you'll allow calls from.
INSTRUCTIONS & INFO
Do not disturb mode mutes sounds and the screen will remain off for incoming calls and alerts, but not alarms. To turn on do not disturb mode, from the clock screen swipe down from the top of the screen.
Select the Do not disturb mode icon.
Select the Check icon.
To turn 'Do not disturb mode' off, from the clock screen, swipe down from the top of the screen, then select the Do not disturb mode icon.