A method of authenticating a user seeking access to an unlicensed wireless communication system includes delivering to an unlicensed wireless communication subscriber device licensed wireless communication system security information. An authentication result produced by the subscriber device is processed in response to the licensed wireless communication system security information. The authentication result is compared with an authentication value to selectively produce an authentication command. Unlicensed wireless communication between the subscriber device and an unlicensed wireless communication system base station is enabled in response to the authentication command.