In stock Android, it doesn't quite work that way. Ideally, there would be a built-in option to allow only calls from folks in your contact list. You miss out on

In stock Android, it doesn't quite work that way. Ideally, there would be a built-in option to allow only calls from folks in your contact list. You miss out on all notifications (e.g. from email, etc) when you use 'do not disturb' this way.