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This is a list of Illinois companies which includes notable companies that are headquartered in Illinois, or were previously headquartered in Illinois. In general, this list does not include companies headquartered in one of the municipalities of the Chicago metropolitan area .
Verizon formerly served ex-GTE areas in parts of California, Florida and Texas before selling to Frontier Communications in 2016. Claro Puerto Rico, which serves every exchange in Puerto Rico, has been owned by the international telecommunications giant América Móvil since in 2007.
The company was formed in 1983 and is headquartered in Chicago, Illinois. UScellular is the fifth largest wireless carrier in the United States, with 4.5 million subscribers in 21 states as of October 31, 2024. [1] In May 2024, T-Mobile US announced it would acquire UScellular's wireless business in a deal worth $4.4 billion. [2]
The company was formed by Verizon in 2009 to facilitate the planned sale of some local subsidiaries to Frontier, which was completed on July 1, 2010. The company was set up to allow for a Reverse Morris Trust merger, allowing Verizon to spin off the company to Frontier tax-free. Its primary purpose was to transfer Frontier ILEC Holdings as well ...
Frontier Communications owns local telephone operating companies consisting of companies it has owned under its previous name Citizens Communications Company, companies it acquired from Global Crossing, and companies it acquired from Verizon Communications which are grouped under its subsidiary Frontier Communications ILEC Holdings. The ...
The ICC is in the midst of a “Future of Gas” proceeding to consider the future of gas utilities in Illinois given the state’s goal of economy-wide 100% clean energy usage by 2050.
T-Mobile US, Inc. is an American wireless network operator headquartered in Bellevue, Washington. Its largest shareholder is Deutsche Telekom, a company that operates telecommunications networks in several other countries. T-Mobile is the second largest wireless carrier in the United States, with 130 million subscribers as of December 31, 2024. [6]
Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.