sbcglobal customer service Sbcglobal.net is a domain name that is available online. You definitely must have used this email address or this must have been used by someone you know. It is a very old service provider.It is good if you know all about sbcglobal emails. There are sbcglobal email addresses that were issued by SBC communications. SBC Communications is a company that was earlier known as Southwestern Bell Corporation. This was merged with AT&T in 2005. The combined company is known as AT&T.