Your iPhone now serves as a Google security key Smart Lock for iOS could save you from carrying a fob around January 14, 2020 https://www.engadget.com/2020/01/14/google-smart-lock-security-key-ios/
Google improves support for physical security keys on iOS June 3, 2020 https://appleinsider.com/articles/20/06/03/google-improves-support-for-physical-security-keys-on-ios Google: Making the Advanced Protection Program and Titan Security Keys easier to use on Apple iOS devices