Computer Help and Support

Just to find out what kind of operation they are, for example an ISP. Found some interesting reading about their mail system and why it now goes through yahoo. Now, are you 100% sure you were hacked because it sounds like you have just got caught up in their internal malarkey.

Have a read of this article. https://www.mytechreviewer.com/what-is-sbcglobal-net/
There is a graphic of server settings on this page, both incoming and outgoing. None of it is very intuitive. For example sbcglobal uses POP3 protocol, which is when the mail is downloaded to your device and does NOT stay on the server.....BUT it also uses Yahoo.com which as far as I know is IMAP (where the mail stays on the server until you delete it, so that it's available to other devices).

So when you say "...a free email app for android" that's not really what you're looking for. It seems like you need an email provider. Once you have an email account with a provider, you then need an app of some sort to read your email ie. connect to your mail provider and open your mail.

In that regard, Gmail is the most widely used. Personally I hate it but have an account for emergency use under a pseudonym. Gmail works well with android, because ...Google. Maybe you need to set up a new account and start from scratch.

Here's a list of free email providers, but maybe you can get your old account going with the info on the first link. Good luck.
https://www.lifewire.com/best-free-email-accounts-1356641