Verizon Wireless has agreed to buy Alltel Corp. for $5.9 billion, which would make it by far the largest cellular carrier in the U.S.

Verizon Wireless would also assume $22.2 billion in debt in the deal, bringing the total value to $28.1 billion, the parties said Thursday.

The deal comes just seven months after Alltel was taken private by Fort Worth, Texas-based TPG Capital and a unit of Goldman Sachs Group. They paid $24.7 billion for the stock and took on $2.7 billion in debt, bringing the value of that deal to $27.4 billion.

Alltel has 13.2 million subscribers in 34 states, mainly in rural areas away from the coasts. Added to Verizon Wireless 67.2 million subscribers, the size of the combined company would surpass the current U.S. cellular leader AT&T Inc., with 71.4 million subscribers.

The parties expect the deal to close by the end of the year, pending regulatory approvals. The deal is likely to face scrutiny by the Department of Justice and the Federal Trade Commission, but analysts expect it to pass.

Shares of New York-based Verizon Communications Inc., the controlling parent of Verizon Wireless, rose $2.16, or 5.8 percent, to $39.14 by late morning. Verizon Wireless' other parent is Vodafone Group PLC of Britain, with a 45 percent share of the joint venture.

Verizon Wireless expects that the deal to add immediately to earnings, excluding transaction and integration costs. It expects the deal to generate "synergies" of more than $9 billion due to reduced capital and operating spending. Analysts believe Verizon Wireless pays Alltel hundreds of millions of dollars a year in roaming fees, since Alltel provides coverage in many areas where Verizon Wireless does not.

In a statement, Verizon Communications Chairman and Chief Executive Ivan Seidenberg said Alltel is a "a perfect fit," given its valuable customer base and solid financials. He also pointed to the fact that the carriers share the same network technology. San Antonio-based AT&T and another wireless carrier T-Mobile USA use an incompatible technology.