First of all, you need to go to the Yahoo log-in page. After that, you need to enter the email address and tap on the next option. Now, you need to click on the use of text and email to log-in or you can try another method to log-in. Now, you have to enter the missing digits of the phone number. Get yahoo customer service for more info. 1-877-749-5444 https://monktech.net/yahoo-customer-service.html