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You can use the self-service Yahoo Account recovery feature from your computer to retrieve this information.
Please go to the following site:
Enter your email address. It will ask for you to identify yourself as owner of the account in some way (such as phone number, alternative email, etc...).
It will then guide you through the step required to reset it.
Once that is done, you should be able to sign into Yahoo Mail once more on your phone and computer.John