Your smartphone can act as your security key to authenticate your Google credentials on the web. Learn how to set that up on an Android device or an iPhone. Google offers a variety of ways to add two-step verification to better protect and secure your account, but the simplest option may be to register your phone as your means of verification, which you can do on an Android or iPhone.
Link: How to use an iPhone or Android device as the security key for your Google account
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