Do Not Disturb automatically mutes all calls, notifications, and alerts you get when your iPhone is locked. The feature can be enabled by tapping on the “Crescent moon” icon from the Control Center.

If you 3D Touch/Haptic Touch the Do Not Disturb icon, you can enable it from one hour or until you leave the current location. You can also set up Do Not Disturb on a schedule by going to Settings > Do Not Disturb > Scheduled.

By default, Do Not Disturb works as an all-or-nothing switch. However, you can add exceptions to the Do Not Disturb filter in a couple of ways.

The Favorites tab in the Phone app is a modern take on the speed-dial. Add a couple of numbers that you frequently contact for a one-tap connection. The Favorites feature also has a couple of other benefits such as the option to add the Favorites widget to your Lock screen.

The Favorites list also integrates directly with the Do Not Disturb feature. To set things up, open the Settings app, go to “Do Not Disturb,” select “Phone,” and then tap on “Allow Calls From.”

Next, switch the setting to “Favorites.” With this set, anyone who calls you from your Favorites list will be let in.

iOS also has an option in the Do Not Disturb section called “Repeated Calls.” When you enable this feature, a second call from the same caller within three minutes will be let through.