Yes, you can. According to China Telecom official website, roaming and long-distance charges have been cancelled, and the secondary card of Gansu Telecom can use Tik Tok traffic from other provinces. China Telecom refers to China Telecom Group Co., Ltd. and China Telecom Group Co., Ltd. for short, "China Telecom" or "China Telecom Company". China Telecom, founded on April 27th, 1995, is a state-owned super-large communication backbone enterprise and a global partner of Shanghai World Expo, and has been selected as one of the "Top 500 Enterprises in the World" for many years.