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CallKit is a new framework introduced by Apple on iOS10 in 2016. It aims to improve the VoIP experience by allowing apps to integrate with the native phone UI. By adopting CallKit, your app will be able to use the native incoming call screen in both the locked and unlocked states. This article will explain how to use [CallKit] and [ZEGOCLOUD] to build a Video Call App with a native calling experience. The following article will also explain how the Incoming Calls function is used to implement.