How to set up Notification Summary in iOS 15

If you get a million app notifications a day, and have become numb to the important ones, iOS 15's Notification Summary feature is about to be your new best friend. Notification Summary will let you zero in on what you might call your "important-but-overwhelming-due-to-constant-pestering" apps, and receive a summary report of their notifications for you to review at a time of your own choosing. By default, you'll get your report twice a day, but you can opt to see it anywhere from once to 12 tim...