Mobile Connect allows users to log-in to websites and applications without passwords and usernames by matching the user to their mobile phone. Technology suppliers deliver the technology needed and enable easy integration with the operators’ mobile networks. This way the users of any mobile network offering Mobile Connect can log in and be authorized for any application.
Mobile Connect allows smooth deployment by building on top of operators’ current network assets. This means minimum changes to existing infrastructure. The operator is ready to launch just by adding a standard based identity gateway and authenticator.
How does Mobile Connect work? High level system flow (https://developer.mobileconnect.io/)