Technically, the number of the cell phone must be introduced when the new system will be used the first time and later the password will be sent when a link will be clicked on the login screen. It’s a one time password so no one will have the chance to exploit it. However, if the user loses the phone, another person in possession of it will know the password, which is displayed even on locked phones. Yahoo’s vice president of product management for consumer platforms Dylan Casey said: “This is the first step to eliminating passwords. I don’t think we as an industry has done a good enough job of putting ourselves in the shoes of the people using our products.” Currently this password system is an opt-in service in the U.S. and Yahoo said nothing about the other users from the world.