Cingular's Quiet Takeover Change is coming for AT T Wireless's 21.7 million customers -- although they wouldn't know it from watching the company's commercials or shopping in its stores. The cell phone provider is expected to complete its \$41 billion merger with Cingular Wireless within weeks.\\&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;