Are you Att subscriber, also you are able to log-in up for the free directive HBO service. But sometimes prior to logging up & verifying the number, you are getting the error 43406. You should join the Att customer service to fix Att Customer Service. They will let you know about the main causes of this error code. Also, they will provide you some resolving steps. 1-855-436-9666 http://att.customer-servicephonenumber.com/