BellSouth Mobility [SEP] dissolved or abolished
Mobile Phone Service, Inc. among the Baby Bells. It ran AMPS and D-AMPS across most of the territory covered by the BellSouth landline company. In 2000, it became part of the Cingular Wireless network, and the BellSouth branding was dropped; however, the company continued to exist as an operating subsidiary.
In 2004, following Cingular's acquisition of AT&T Wireless Services, BellSouth Mobility ceased to exist when it was legally merged into New Cingular Wireless PCS, LLC, the renamed former operating subsidiary of AT&T Wireless Services
Mobile Systems, a division of Southwestern Bell Telephone Company, was also partnered with GTE, a partnership which that was later dissolved.
In 2001, BellSouth partnered with Southwestern Bell Mobile Systems. This partnership renamed the division from BellSouth Mobility, LLC to Cingular Wireless, LLC. It also transformed Houston Cellular into Cingular Wireless.
Recent Development.
In 2006, the parent company of Southwestern Bell Mobile Systems, AT&T Inc., acquired BellSouth. Eventually, this led to the renaming of Cingular Wireless, LLC to AT&T Mobility