Technology shares are down in mid-day trading while Sprint Nextel Corp. (NYSE:S) lobs a regulatory challenge to a merger between rivals. The wireless company is off more than 1% in mid-morning trading after it filed a petition with federal regulators to block a merger between AT&T Inc. (NYSE:T) and T-Mobile USA. At issue, according to the petition filed with the Federal Communications Commission, is control over T-Mobile’s U.S. spectrum licenses, over which phone signals are transmitted. The company said the merger would leave AT&T and Verizon Wireless with more than 80% control of the wireless market. Sprint also asked for a broader ban on the merger, arguing that it would lead to higher prices, harm the public interest and reverse government policy to encourage competition. Meanwhile, Yahoo Inc. (NASDAQ:YHOO) is down after it reportedly resolved a dispute with partner Alibaba Group. The dispute involved the Chinese company's transfer of its highly valued online payments unit to Chief Executive Jack Ma, according to two unnamed sources cited by the Associated Press.