Softbank Chief Strategy Officer Tetsuzo Matsumoto recently said that the company is “happy” with its current situation regarding the iPhone 3G, despite reports of slower-than-expected sales. “We introduced the iPhone without any big market trial, so the initial package had some problems,” Matsumoto told Dow Jones Newswire at the GSMA Mobile Asia Congress. Citing research from MM Research Institute, Newswire reports that Apple…