No need to go to Sham Shui Po to buy SIM card for travelling anymore. This Mainland China Prepaid SIM Card is 【1.2GB / 120-day / can get over firewall】edition. Although it does not support with voice call, 4G/3G network edition can support 1.2GB mobile data for getting over the firewall. You can connect to Facebook、Google、YouTube、Twitter even in mainland China. Valid for 120 days after activation.