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In the early 1980s, Bell Labs received a patent for what became AT&T's "Advanced 800 Service", a computer-controlled system where any toll-free number could point to any destination number, such as to a small business local number instead of a special InWATS line, and an itemized bill generated only for the calls the business actually received.
CenturyLink grew as Century Telephone and later CenturyTel through acquiring many small and mid-size telephone companies. These include: CenturyTel of Chester, Inc. (Iowa, Minnesota) CenturyTel of Colorado, Inc. – formerly Universal Telephone; CenturyTel of Eagle, Inc. – formerly owned by Pacific Telecom
Embarq Corporation was the largest independent local exchange carrier in the United States (below the Baby Bells), [2] serving customers in 18 states and providing local, long-distance, high-speed data and wireless services to residential and business customers.
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Qwest Corporation, doing business as CenturyLink QC, is a Regional Bell Operating Company owned by Lumen Technologies. It was originally named Mountain States Telephone and Telegraph Company , later becoming known as Mountain Bell , then US West Communications, Inc. from 1991 to 2000.
The company was founded in 1909 as The American Telephone Company.It was owned by Sprint Nextel until 2006 when it was spun off into Embarq.CenturyTel acquired Embarq in 2009, at which point United Telephone of Kansas began doing business as CenturyLink.
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[4] [5] In practice, some RespOrgs do abuse the system by stockpiling millions of toll-free numbers for advertising purposes, because the enforcement of the regulations has been weak and sporadic. This situation has led to periodic creation of overlay plan toll-free area codes to prevent exhaustion of the SMS/800 available number pool.