It doesn't do scheduling. The do not disturb feature just silences the phone, so text, calls, and alerts don't go through. However, the feature also has an option that when turned on allows a call to go through if the person calls twice within like 2 minutes. So, call once, declined like phone is on silent. Call back immediately, the call goes through. You can also add people onto your favorites list and they'll not be stopped by the do not disturb feature.