Go through the Yahoo password recovery process. I haven't been through it in a while so I am not sure exactly what they have, but if you don't have access to the original email you used to set it up, there should be an option to indicate that and then do the confirmation using the security questions instead. If you don't know the security questions, don't have the email account anymore, and either never associated it with a celll phone or have lost access to that cell number, you are plumb out of luck. We aren't magicians and even if we were, it would be illegal for us to compromise Yahoo's security.