When you can't access the sbcglobal email on the phone or computer and it keeps showing the incorrect username or password error. It means, something is wrong with the login credentials. Here are the guide to get that fixed.
first of all, you need to reset the password for your sbcglobal account.
Go to the account settings and update the imap and pop3 servers on the outlook account.
Remove the account from the phone and then re-add the sbcglobal.net email on your account.
Let's check that the servers are working completely fine. if they are down, you need to wait until it will start working fine.
So these are the steps to fix the sbcglobal email problems. in case, if you are dealing with some other issues. you need to visit: Why is sbcglobal email not working on outlook?