1GB = 1 billion bytes; actual formatted capacity less.
Size and weight vary by configuration and manufacturing process.
FaceTime calling requires a FaceTime-enabled device for the caller and recipient, and a Wi-Fi connection. Availability over a mobile network depends on carrier policies; data charges may apply.
Data plan is required. 4G LTE Advanced and 4G LTE are available in selected markets and through selected carriers. Speeds are based on theoretical throughput and vary based on site conditions and carrier. For details on 4G LTE support, contact your carrier and see www.apple.com/ipad/LTE.
Mobile data plan is sold separately. Mobile data service is only available on Wi-Fi + Cellular models. The model you purchase is configured to work with a particular mobile network technology. Check with your carrier for compatibility and mobile data plan availability.
Embedded Apple SIM in iPad Pro (9.7-inch) may be disabled when purchased from some carriers. See your carrier for details. Apple SIM and embedded Apple SIM are not available in China.