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Facebook's Messenger app now supports CallKit on iOS 10, brings VoIP calling to CarPlay
iOS 10 lets third-party developers use the standard call look and feel from the Phone app in their own apps with something known as CallKit, and Facebook's latest update to Messenger is already taking advantage of it. Messenger for iOS has let you make calls over the Internet to your friends for a while, and now incoming calls to Messenger will behave just like standard phone calls. This improved behavior even extends to CarPlay.