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iOS do have this integration in the form of Caller Identification. An app can provide a caller information to the Phone app (I believe in a form of a database, rather than sending each call to remote server) and it will show up in the caller screen. Any VoIP app that integrate with CallKit will automatically get this functionality as well.

Whoscall is one example and is pretty popular in Asia.

Huh, neat. I guess I never really thought about how large phone storage has gotten. (A thought—if they're doing this all-locally, then they don't technically even need a separate API: phone number databases could just act as Contacts sources, with each virtual contact containing a field denoting "not actually someone I know, just someone who is calling me" so they won't show up in the Contacts app.)

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