Encamped along the aisles of the massive Zhongguancun Kemao Electronics Market in Beijing are many people like Li Zhongxin, of the Beijing Xinyu Lianhe Telecom Equipment Co. Li sits atop a plastic stool in front of his open-air stall on the third floor, scanning the throngs of shoppers for would-be customers. There’s no sign of Apple’s iPhone among the thicket of cell phones, handset covers, and …