larger cell providers are trying to make passwords for every website you visit obsolete and are trying to make it more available to where the site would remember you right away. Most people would find this to be an invasion of privacy as it would track your phones information to allow you to login to a website. the authentication sounds smart and I think it’d work but it’s probably a ways off from being an accepted thing.
Krebs security Article 09/18/18
https://krebsonsecurity.com/2018/09/u-s-mobile-giants-want-to-be-your-online-identity/#more-45035
Blakes Cyber Security Blog 