A comprehensive authentication and identity system and method are disclosed. A central profile is created for a user which includes user information that can be passed back or otherwise utilized by websites (e.g. for registrations, logins, etc.) The user information may include the user's username, password, contact information, personal information, marketing preferences, financial information, etc. For website registrations, the user may provide a mobile communication number that is utilized to perform a type of mobile communication device verification process. As part of a website login, the user may provide identifiable information (e.g. a username) that is looked up by the system or website to determine a mobile communication number for the user, which is used for a verification process. If the verification process is completed successfully, the user may be logged into the website. For accessing the system directly, a user may go through a mobile communication device verification process.