Actually leave an option for people who don't have cellphones---the alternative to get around the demand to add a phone number is not there
Yahoo put the alternative back on the "add your cellphone number," but it has disappeared again. Go back to Classic, please.
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Kathy McGhehey
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In order to add a recovery method (phone number) you can go to mail.yahoo.com and sign in. After that, in the top right corner click on your name and on “Account Info”. Go to “Account Security” and sign in again. After that, click on phone numbers and you will be able to add another one.