Take the student ID card, registration card and other documents that can prove your identity, and go to the sixth floor of Yifu Library in beijing university of chemical technology East District. Go to the middle room and explain to the teacher inside that if you want to open the international traffic service, the teacher will help you open it for free, so that you can use the international traffic to surf the Internet. There is 300M free international traffic every month, hoping to bring you some help!