The United States Department of Justice announced today that it has filed an antitrust lawsuit to block AT&T’s proposed acquisition of T-Mobile.

“The combination of AT&T and T-Mobile would result in tens of millions of consumers all across the United States facing higher prices, fewer choices and lower quality products for mobile wireless services,” said Deputy Attorney General James M. Cole.   “Consumers across the country, including those in rural areas and those with lower incomes, benefit from competition among the nation’s wireless carriers, particularly the four remaining national carriers.   This lawsuit seeks to ensure that everyone can continue to receive the benefits of that competition.”

“T-Mobile has been an important source of competition among the national carriers, including through innovation and quality enhancements such as the roll-out of the first nationwide high-speed data network,” said Sharis A. Pozen, Acting Assistant Attorney General in charge of the Department of Justice’s Antitrust Division.   “Unless this merger is blocked, competition and innovation will be reduced, and consumers will suffer.”  

The DoJ filed the suit in U.S. District Court for the District of Columbia.

The complaint says that the two companies compete head to head nationwide (including in 97 of the nation’s largest 100 cellular markets, as well as compete for business and government customers. “AT&T’s acquisition of T-Mobile would eliminate a company that has been a disruptive force through low pricing and innovation by competing aggressively in the mobile wireless telecommunications services marketplace,” the DoJ says.

From the press release:

The complaint cites a T-Mobile document in which T-Mobile explains that it has been responsible for a number of significant “firsts” in the U.S. mobile wireless industry, including the first handset using the Android operating system, Blackberry wireless email, the Sidekick, national Wi-Fi “hotspot” access, and a variety of unlimited service plans.   T-Mobile was also the first company to roll out a nationwide high-speed data network based on advanced HSPA+ (High-Speed Packet Access) technology.  The complaint states that by January 2011, an AT&T employee was observing that “[T-Mobile] was first to have HSPA+ devices in their portfolio…we added them in reaction to potential loss of speed claims.”

The department said that it gave serious consideration to the efficiencies that the merging parties claim would result from the transaction.   The department concluded AT&T had not demonstrated that the proposed transaction promised any efficiencies that would be sufficient to outweigh the transaction’s substantial adverse impact on competition and consumers.   Moreover, the department said that AT&T could obtain substantially the same network enhancements that it claims will come from the transaction if it simply invested in its own network without eliminating a close competitor.

AT&T said that it would bring back 5,000 U.S. jobs if the merger is approved, according to Retuers. The company, however, has not specified where these jobs would be located.

The DoJ’s announcement has already proven to be good news for Sprint:

Update: Vonya B. McCann, senior vice president of Government Affairs for Sprint, issued the following statement:

“The DOJ today delivered a decisive victory for consumers, competition and our country. By filing suit to block AT&T’s proposed takeover of T-Mobile, the DOJ has put consumers’ interests first. Sprint applauds the DOJ for conducting a careful and thorough review and for reaching a just decision – one which will ensure that consumers continue to reap the benefits of a competitive U.S. wireless industry. Contrary to AT&T’s assertions, today’s action will preserve American jobs, strengthen the American economy, and encourage innovation.”