Models with an embedded Apple SIM or Apple SIM card
The following Wi-Fi + Cellular models have an embedded Apple SIM built into iPad (except in China):
iPad Pro 12.9-inch (2nd generation)
iPad Pro 10.5-inch
iPad Pro 9.7-inch
The following Wi-Fi + Cellular models might come with an Apple SIM card (not available in all countries or regions):
iPad Pro 12.9-inch (1st generation)
iPad (5th and 6th generation)
iPad Air 2
iPad mini 4