You are right that it will be very expensive. Thanks for the tip about buying an unrestricted SIM-card at the border with HK. Will the SIM-card also work in rem

You are right that it will be very expensive. Thanks for the tip about buying an unrestricted SIM-card at the border with HK. Will the SIM-card also work in remote parts of China? Or is it only usable in Shenzhen?