What is a refreshing card?
"Changshuang Card" is an exclusive number card product jointly launched by China Unicom and other companies. At present, the cooperative companies include Tsingtao Brewery Co., Ltd., Hunan China Tobacco Industry Co., Ltd., Hunan Huangye Food Co., Ltd., Hunan Leisure Technology Co., Ltd. and Hunan Suxin Technology Co., Ltd., and jointly launched Qingdao Unlimited Play Card, Everyday Play Card, Zhang Xinfa Play Card and E-sports Play Card respectively.