Use an Android phone for 2-step verification on iOS devices

Quick launch summary 

Earlier this year we announced the ability to use your Android phone’s built-in security key for two-factor authentication in G Suite.

Now, you can use devices with Android 7.0+ (Nougat) to verify your sign-in to Google and Google Cloud services on Apple iPads and iPhones.

• Admins can learn how to enforce the use of security keys in their organization by visiting the Help Center. 
• End users can activate the security key on their Android device and use it to verify iPhone and iPad logins

More Via Google Blog