Siri + Apps.
Your apps can work with Siri, allowing users to access content and services using just their voice. SiriKit extends support for messaging, photo search, and phone calls to more apps, and includes support for new services such as ride booking and person-to-person payments.
Maps + Apps.
Apps that offer ride booking, restaurant reservations, and other location-related services are accessible from within Maps, allowing users to book, track, and pay. Maps even suggests relevant apps for services in a user's current location.
Phone + Apps.
Apps that support VoIP can now use CallKit to work with the Phone app. Calls display directly on the lock screen, and all your app's calls are included in the Recents and Favorite tabs in the Phone app. Users can access controls like Mute and Call Waiting, easily open your app right from the call, and add your app as an option for contacts in Favorites.