Hello. My name is, Mike. I'd like to try and assist you with your issue. If you need to login to your Yahoo account and do not remember the password, there are two other options that you can use other than using the phone number on the account, which appears may no longer be valid. You can choose the option to answer security questions, or have information sent to a backup email account.
If you are unable to answer the security questions, and do not have a backup email assigned to your account, you will have to contact Yahoo Customer Support. Below are the instructions.
You can do this by going to the following link and following my instructions below:
For Topic 1 choose: "Password ***** sign in"For Sub-Topic 2 choose: "Change password"For Recommended Options 3 choose: "Email"
This will take you to a Yahoo customer service email contact form. Fill out all of the pertinent information and Yahoo will contact you to help resolve the issue.