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If you want to set this up yourself, just go to the "Security" section of your Google Account settings. Click on the "2-Step Verification" section, and there should be a new option called "Google Prompt." The option works on Android and iOS (provided you have an iPhone 5S or later). Of course Google recommends you have some kind of secure lock screen if you're going to use this feature, as is standard with other forms of phone-based 2FA. Enabling Google Prompt will automatically disable "Sign in with your phone," which used a similar prompt as a password replacement.

If you aren't using 2FA on your Google account, you have no excuse now, since the push notification makes 2FA faster and easier than ever.