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Cellular Union Wins Final Approval The company's \$41 billion merger with AT T Wireless poses it with the challenge of stitching together networks, billing systems and customer-care operations without inconveniencing customers.&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt; 