Forum Know How to connect to Yahoo mail via Yahoo Phone Number

If you want to know how to connect to Yahoo mail, then you need to join Yahoo Phone Number to get the best information. The support executives will let you know you need to check your account is working outside of the application. Then you gave to update the operating system. After that, you have to remove & re-dd the Yahoo mail to iOS mail.
https://www.att-customerservice.com/yahoo-customer-support-number/