Research in Motion was the top-selling wireless handset maker in the U.S. in July, marking the third consecutive month the company has held the position, according to Avian Securities' monthly U.S. wireless handset survey. The BlackBerry Curve was the best-selling device. LG ranked second in the survey, driven by demand for its new Dare device at Verizon outlets, followed by Samsung. The study is based on a survey of service representatives at retail stores of the four major wireless operators--AT&T, Verizon, Sprint and T-Mobile. Report