Antitrust regulators in the Justice Department have approved the proposed acquisition of AT&T Wireless Services Inc. by Cingular Wireless LLC. Cingular's $41 billion acquisition will create the nation's largest wireless telephone company. The FCC is expected to approve the merger as early as Tuesday. Under the agreement with regulators announced Monday, Cingular must divest itself of assets in eleven states. Read AT&T's letter to its customers regarding the merger here [PDF]. Read Cingular's press release announcing the deal here and more information on the new company. Read the Department of Justice press release here. AP has more.