World Com

For a time, WorldCom was the second largest long distance phone company after AT&T in the United States. WorldCom grew by acquiring other telecommunications companies, most notably MCI Communications. The company also owned the Tier 1 ISP UUNET, a major part of the Internet backbone. The corporate office of the company was based in Clinton, Mississippi before moving to Ashburn, Virginia. Originally, WorldCom bore the name of Long Distance Discount Services, Inc. It began in Hattiesburg, Mississippi in 1983.

The company name was changed to LDDS WorldCom in 1995, and later just WorldCom. Later, the company merged with MCI, Inc. and further on purchased by Verizon.