True. SBC bought out what remained of AT&T, which is mostly the old AT&T Long Lines, in late 2005, and then changed the name of everything to "lowercase" at&t.
BellSouth as a new entity, was spun-out of AT&T effective 1-Jan-1984 atq divestiture, as the new holding company of the two southeastern US BOCs: The South Central Bell Telephone Company (no Telegraph here), and Southern Bell Telephone and Telegraph Company.
The recent change of BellSouth into the at&t name is VERY recent, only as of late Dec.2006 / early Jan.2007, when SBC's at&t finally gets the regulatory go-ahead to buy out BellSouth. More on that later.
True. This joint venture took effect sometime in Spring or Summer 2000 if I have my dates correct. And as stated by others and myself in earlier posts, SBC owned 60% of Cingular, and BellSouth owned 40%. The HQ were placed in BellSouth's HQ city of Atlanta GA, probably as a concession to BellSouth being the minority holder of Cingular. This joint-venture "merged" the old SBC Mobility (or Southwestern Bell Mobility), and BellSouth Mobility.
This is true, but only as far as SBC and (separate) BellSouth being the joint-owners of Cingular.
HOWEVER, pre-SBC AT&T was NOT part of this "mix" at that time, with the exception of the old Macaw Wireless which was purchased by AT&T and thus named AT&T Wireless ... which only a few short years ago being sold off MOSTLY to Cingular, but also to Alltel Wireless for a few markets. But pre-SBC AT&T did NOT have ANY ownership over BellSouth whatsoever in the post-divestiture period.
Well, it is muddied somewhat, since pre-SBC AT&T did NOT own any of BellSouth at all, especially since BellSouth was created with the1984 breakup of AT&T's "Bell System".
SBC bought out AT&T and changed the name of the entire operation to lowercase at&t in late 2005. They then made an offer to buy out BellSouth, this offer took about a year of regulatory investigation before the final regulatory and government go-ahead nod was given for SBC's at&t to buy out BellSouth at the end of 2006/ beginning of 2007. It's only now, Spring 2007, where BellSouth is finally being re-branded as lowercase at&t. And now that SBC's at&t owns BellSouth, it puts Cingular under complete "at&t" control, so even Cingular is now slowly starting to be re-branded "at&t mobility". It hasn't yet been that widely announced, but to keep the former Cingular, wireless, side of at&t with a sort of "separate, wireless" identity, it will most likely be known as at&t mobility, although right now, the promotion is simply that "Cingular is now (the new) at&t", presently without any reference to the added word "mobility".