ON . Customize Settings: Apple also allows you to customize the settings for Do Not Disturb feature so you can fine tune it to your requirement. Launch the Settings app Tap on Notifications under the Do not Disturb toggle Then tap on Do Not Disturb . You will now be able to schedule the Do Not Disturb feature, allow some phone calls or allow persistent callers to right through. Tap on Allow Calls From to ensure you don't miss an important call from anyone in your Favorites list in Contacts (which is the default). You can also choose any Groups you have set up in your Contacts or you can also select Everyone to let all calls ring through or No One if you don't want to talk to anyone, say while you're taking a short nap. You can enable the Repeated Calls toggle, if you want a second call from an unknown number within three minutes to ring through. This feature may be useful in a situation where you get an emergency call from an unknown number. Repeated Calls toggle is enabled by default. You can tap on the toggle to turn it OFF to disable this feature. Schedule Do Not Disturb: If you don't want to enable and disable the Do Not Disturb feature manually, then you can set the starting and ending hours for when you don't want to be disturbed, so that your iPhone or iPad turns on the Do Not Disturb settings during these hours