Telecom business hall. According to Netease, in Yuyao, the telecom business hall is one of the best choices to buy a flow card. Among them, the business halls of Mong Kok Company, Windmill Shamenkou, Overseas Chinese, Feng Ke, Xia Lang and Yuanshan Street are the most crowded. In the fast-selling card area, mass-produced flow cards are diverse, cheap and easy to buy.