As you have a new phone number, your can try to reset your Yahoo password by asking Yahoo to send you a password recovery mail on the alternate email ID you may have mentioned on your Yahoo profile. Alternatively, you can also recover your password by answering correctly the secret question you may have set while signing up on Yahoo.
To know more about how to execute the above alternatives, you can refer to the following Yahoo support page:
https://help.yahoo.com/kb/yahoo-account/recovering-lost-forgotten-password-sln2047.html
Hope this will resolve your issue.
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