Just check on apple.com, it's clear there: Pad mini with Wi-Fi + Cellular can roam worldwide on GSM/UMTS networks. In countries without compatible LTE networks, iPad mini will operate on GSM network technologies such as HSPA+ and DC-HSDPA. When you travel internationally, you can use a nano-SIM card from a local carrier. So all A/V/S version will use GSM networks in China ( Unicom or Mobile, not telecome ).