| Southwestern Bell Mobile Systems |
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Southwestern Bell Mobile Systems, LLC is one of the companies that provide cellular telephone service under the AT&T Mobility brand. It was created in 1984 as '''Southwestern Bell Mobile Systems, Inc.''' as a split-off of Advanced Mobile Phone Service , the original wireless subsidiary of the Bell System . It was held by Southwestern Bell Corporation . Southwestern Bell Mobile Systems did business under the Cellular One brand name until 2000 . It continued to operate as Southwestern Bell Mobile Systems until 2000 , when SBC Communications and BellSouth combined their wireless operations into a single company, Cingular Wireless . When AT&T acquired BellSouth , Cingular became AT&T Mobility. SBMS continues to operate as an AT&T Mobility subsidiary as Southwestern Bell Mobile Systems, LLC. d/b/a Cingular Wireless. |
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