Cingular Closes \$41 Bln ATT Wireless Deal  NEW YORK (Reuters) - Cingular Wireless on Tuesday closed  its \$41 billion cash purchase of AT T Wireless Services Inc.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AWE.N target=/stocks/quickinfo/fullquote"&gt;AWE.N&lt;/A&gt;, creating the biggest U.S. mobile telecom service with  more than 46 million customers.