Can an iPhone app block phone calls?

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EDIT: See Rajan Maheshwari’s answer below. CallKit now provides this. Even things that seemed they would never change, can change eventually.

Anything that modifies a user’s ability to make or receive phone calls is going to run afoul of Apple’s basic approach to third-party apps. There are a lot of things that are questionable and you might get away with. Blocking calls is clearly forbidden.

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