Quick Look Selectively allow calls
Block all calls
If you really want a bit of peace and quiet with no interruptions — and no exceptions — tap the No One option to silence all incoming calls.
allow favorites
You can add Contacts to your Favorites list in Contacts. If you’d like calls from this group to get through to you even if Do Not Disturb is active, tap Favorites.
allow groups
If you’d like a specific group of contacts to be able to reach you, tap that group’s name in the list below; groups can be managed on a Mac or at iCloud.com.
allow all calls
To stop notification banners and alerts and number badges on app icons from distracting you, but still receive calls, choose Everyone.