https://auth0.com/blog/firebase-phone-authentication/
origin - http://www.pipiscrew.com/2017/10/phone-number-authentication-with-firebase/ phone-number-authentication-with-firebase
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https://auth0.com/blog/firebase-phone-authentication/
origin - http://www.pipiscrew.com/2017/10/phone-number-authentication-with-firebase/ phone-number-authentication-with-firebase