Let your service provider know you are leaving for China. You may be able to work out a data plan. If this is not an option you may purchase a temporary Chinese sim card and data plan for smartphones from China Mobile, China Unicom, or China Telecom.
This process may require a passport depending on the company and your purchase. It is useful to remember that landlines in China have 8 digit numbers, while cell phones have 11 digits. Please talk to your programme about obtaining a sim card on arrival into China.