How to change Yahoo phone number without signing in?

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To change your phone number on Yahoo without signing in1-888-481-0582, you will need to regain access to your account first. If you cannot sign in, use the Yahoo Sign-in Helper1-888-481-0582. Enter your email address and, if prompted, try alternative recovery methods such as using an alternate email or answering security questions. Once you regain access to your account 1-888-481-0582, sign in and navigate to the "Account Security" section under "Account Info." From there, you can update your phone number. If recovery options fail, contacting Yahoo Support 1-888-481-0582 for further assistance is your best alternative.