The U.S. Justice Department (DOJ) has filed a lawsuit in federal court to stop AT&T from taking over rival T-Mobile. The government said the proposed $39 billion transaction would substantially decrease competition in the U.S. mobile industry.

Should the merger be completed, AT&T would be, by far, the largest U.S. wireless company with Verizon Wireless second. Sprint/Nextel would be a distant third. The suit, filed in U.S. District Court for the District of Columbia, signaled the government's determination to prevent that large of a consolidation in the wireless industry.

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