Sometimes it is so hard to recover your yahoo account password without phone number or email address. Because yahoo asking phone numbers and alternative email addresses to verify yahoo’s account then only it will allow you to change or reset the yahoo account password. but if you are using your primary device with the same IP address then it might allow you to change the password with the help of yahoo security questions. You need to enter the answer to your account security question then it will verify your account and show you a way to change or reset Yahoo account password with the phone number or Alternative email address.