More than 14 days. China United Network Communications Group Co., Ltd. (hereinafter referred to as "China Unicom") was formed by the merger and reorganization of the former China Netcom and the former China Unicom on June 6, 2009, and the pre-job training of customer service lasted more than 14 days. Unicom's customer service post is responsible for maintaining customers, recommending and publicizing mobile value-added services to China mobile customers by telephone, and answering business questions.