The Three Kings of Wireless One way or the other, the U.S. wireless phone industry is headed for further consolidation. Reports yesterday that Nextel and Sprint are in merger talks had Wall Street swooning and consumer advocates worrying. &lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2" color="#666666"&gt;&lt;B&gt;-washingtonpost.com&lt;/B&gt;&lt;/FONT&gt;