Silent mode will quiet your device's notifications. When your device is in silent mode, it will not make a sound to notify you of incoming notifications. You can set it to vibrate to alert you to incoming notifications with vibrations instead of sound.
Note: Do Not Disturb mode silences all calls and notifications.
From the Home screen, swipe up from the bottom of the screen to access the Control Panel.
Tap Do Not Disturb.
Note: You can also use the Volume buttons to lower the volume to silent, or switch the Ring/Silent switch on the side of iPhone to silent.