Apple is expanding what Siri AI can do in and across apps in iOS 27.3, which is available to developers as of today. Siri can complete tasks across Calendar, Files, Finder, Journal, Mail, Maps, Messages, Music, Notes, Photos, Preview, Reminders, Safari, Shortcuts, and Weather. You can ask Siri AI what you can do with each app to get more information on what's possible. In Mail, for example, Siri can unsubscribe you from mailing lists and undo recently sent messages.