Prepaid sim cards for internet

First, you should understand what mode your cellphone supports, WCDMA, CDMA or GSM. Then you need to choose an internet service provider according to the modes. China has three telecom companies, China Mobile, China Unicom and China Telecom. China Unicom mainly supports WCDMA and GSM. It doesn’t matter if you can’t buy a sim card at the airport. There are many offices in the city where you stay. You can buy the data package sim card easily.