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When was your last time that you successfully accessed your email on phone or computer?
You made no any changes in mail settings on both your phone and computer before the issue happened?
Thanks for requesting remote assistance session. FYI - It needs extra charge and it is not necessary at the moment.
> You made no any changes in mail settings on both your phone and computer before the issue happened?
If you answer is NO, then it should be some changes at the server side.
Did you ever receive a notification from AT&T about merging AT&T / SBC Global emails to Yahoo?
Anyway, please first try logging in from here to make sure your credential is correct.
Any update please? Do you still need my help?