The company that was named SBC still existes. As many others have noted, after its acquisition of AT&T, SBC renamed itself AT&T, but the surviving company is the one that was formerly named SBC. The company still exists, just under a different name.
This is not uncommon in the corporate world. The company named North Carolina National Bank changed its named to NCNB National Bank, then changed its name to NationsBank, then acquired Bank of America and changed its name to Bank of America. But it is the same company and that is why Bank of America has its headquarters in Charlotte, N.C.--it's the same company as the one-time North Carolina National Bank. As far as I know, the old Bank of America no longer exists, just as I believe the company once known as American Telephone & Telegraph Company no longer exists.
Historical information for T would be historical information for the company formerly known as SBC, because that's the company that is now T.
Wes Leatherock snipped-for-privacy@aol.com snipped-for-privacy@yahoo.com