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Settings -> Phone -> Call blocking and Identification -> "Allow these apps to block calls and provide caller id" You can add phone book apps there. Seems to be

Settings -> Phone -> Call blocking and Identification -> "Allow these apps to block calls and provide caller id" You can add phone book apps there. Seems to be an iOS 12 feature, it wasn't there before. Otherwise it will just use your contacts.

jannes 7y ago
Is this a regional feature? I don't see it on my phone with iOS 12.3. I am located in Europe.
- jmiserez 7y ago
  I'm in Switzerland, so Europe as well. iOS 12.2. Maybe you need a phone book app installed for it to show up.