Can not sign in with my Sbcglobal on my iPhone 8

Registration date
Friday July 7, 2017
Last seen
December 12, 2018
I have not been able to sign into my mail app,, using Sbcglobal for a few weeks. I can sign in on my PC and tablet but not my iPhone 8. The message I get is user id or password is not correct, try again. I have tried numerous times and also changed my password. I have had Sbcglobal for about 25years and never had trouble before. I hope someone can give me instructions to fix this.

I apologize if I am on the wrong place or breaking the rules, but don't know where else to go. can't help they said go with Yahoo but I just don't care for it.

Thank You,
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