built-in security key
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Your Android phone's volume key can unlock your Google account
Google just made two-step verification a little easier for Android users. Android phones running 7.0+ Nougat or newer can be used as a physical security key to confirm a user's identity when logging into a Google account with the Chrome browser. When prompted, users will simply hold the volume button on their phone to verify their log-in attempt. This isn't the only option for two-step verification, but it will likely be faster and more convenient than, say, using a physical key fob.
