NEW YORK (CNNMoney) — Facing heavy resistance from the U.S. government to its $39 billion bid for T-Mobile, ATT on Monday officially killed off the deal that would have created by far the nation’s largest wireless company.

ATT (T, Fortune 500) went down fighting. It warned that consumers will be worse off because of the Federal Communications Commission and the Department of Justice’s successful moves to block the deal.

ATT claimed that the deal was necessary because of a nationwide wireless spectrum crunch. As smartphones and tablet sales have soared, consumers’ demand for data — and the spectrum that carries it — has grown exponentially.

“The ATT and T-Mobile USA combination would have offered an interim solution to this spectrum shortage,” Randall Stephenson, ATT’s CEO, said in a prepared statement. “In the absence of such steps, customers will be harmed and needed investment will be stifled.”

Because spectrum is a scarce asset, the wireless industry is scrambling to consolidate, with larger companies buying up smaller companies with big spectrum allotments. Verizon (VZ, Fortune 500) earlier this month bid $3.6 billion for spectrum held by a consortium of cable companies, and Sprint (S, Fortune 500) agreed to throw its partner Clearwire (CLWR) a $1.6 billion lifeline.

ATT’s solution was much grander in scale. The nation’s second-largest wireless provider would have purchased the fourth-largest, creating a megacompany with well over 120 million subscribers.

The FCC and DOJ both sought to block the deal, citing the likelihood of higher prices, worse service, less consumer choice and massive job cuts.

Realizing it would not gain the approvals it needed to buy T-Mobile, ATT ended its bid — but hinted that it will be forced to buy something else soon.

“Adding capacity to meet these needs will require policymakers to do two things,” Stephenson said. “First, in the near term, they should allow the free markets to work so that additional spectrum is available to meet the immediate needs of the U.S. wireless industry. Second, policymakers should enact legislation to meet our nation’s longer-term spectrum needs.”

ATT is currently vying for regulatory approval of its $1.9 billion spectrum purchase from Qualcomm (QCOM, Fortune 500), but industry analysts say that still won’t be enough to satisfy customers’ long-term demands.

Meanwhile, ATT will pay T-Mobile’s parent company Deutsche Telekom a $3 billion breakup fee over the scrapped deal. It will also allocate $1 billion worth of spectrum to the company before the year’s end. ATT also plans to enter into a roaming agreement T-Mobile, which will allow customers of both networks to make use of the other’s network.

That will keep T-Mobile afloat for the near term. But without enough spectrum to deploy a competitive 4G network, and with its parent company determined to sell, the carrier will almost certainly have to merge with someone else.

“For T-Mobile, it’s tough sledding,” said Josh King, general counsel at and former senior corporate development executive at ATT Wireless. “A Sprint tie-up is definitely possible, as is a sale to [Latin American providers] Telefonica or TELMEX.”

Though a Sprint purchase of T-Mobile would mean the third-largest wireless company would buy the fourth largest, analysts believe that it could get approval thanks to Sprint’s puny size compared with market leaders Verizon and ATT.

“If they merge with Sprint Nextel, that would build three big competitors,” said Jeff Kagan, an independent telecommunications analyst. “Merging with ATT would have turned the marketplace into a two-company race.”

Shares of ATT barely budged in after-hours trading, but Sprint’s stock soared 5%. To top of page

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