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This corporation was purchased by Verizon Communications in 2006 and now identified as company’s Verizon Business unit that deals with local residential divisions. It operates mainly in Florida and Virginia.
MCI history along with the histories of companies it acquired clearly reflects trends in American telecommunications history. Long Distance Discount Services INC (LDDS) was started in 1983. In 1994 MCI formed MCI Metro to enter long distance market in Mexico, and unveiled network MCI. Through MCI metro MCI planned to build a $2 billion fiber optic phone network, bypassing local phone companies and offering alternative local service. By 1995 the company had received regulatory approval as a competitive local carrier in 15 states. MCI metro got additional opportunity through Tele Communication ACT of 1996 allowing local phone and long distance companies to compete in each other’s market. MCI Metro is the first to company to sign on BART’s (Bay Area rapid transit officials) along with transit system’s private sector telecommunications partner MFS Network Technologies Inc. Company name changed to LDDS WorldCom in 1995 and later to WorldCom. MCI purchased WorldCom in 1998. MCI Communications purchased WorldCom for US$37 billion.

MCI Worldcom partnered with several universities and provided the high speed telecommunications links between their computer systems. This network, operated under the auspices of the National Science Foundation was called NSFNET, used the TCP/IP protocol that had been developed by the U.S. Department of Defense ARPANet and was the immediate forerunner to the Internet. MCI's network was an integral part of the global Internet backbone

Various services offered by MCI Metro, ATS in Florida are:
Neighborhood calling package
MCI Net Values
Nationwide 200 plus
MCI global connection
Web hosting
Online Backup & sharing
Internet security suite
Secure mail
DirecTV
FIOS TV
Flex T1 plus
Private IP
Ethernet service
Network Equipment
Data center Collocation
Remote backup and restore
Secure gateway
Wireless business plans
Wireless Phones and devices
Intelligent contact routing
Interactive voice response

MCI partnered with several universities and provided the high speed telecommunications links between their computer systems. This network, operated under the auspices of the National Science Foundation was called NSFNET, used the TCP/IP protocol that had been developed by the U.S. Department of Defense ARPANet and was the immediate forerunner to the Internet. MCI's network was an integral part of the global Internet backbone

City:	Mount Prospect
State:	Illinois
Zip Code:	60056
County:	Cook
County Population:	5303683
Time Zone:	Central

Type:	Landline
Date of registration:	18/05/1998
Time:	02/15/2012 13:11:00 PM
Rate Center:	Chicgozn02
Switch CLLI:	CHCGILWJDS0
OCN:	16980