Now for the new 9.7-inch iPad.
All iPad Pro models, iPad (6th generation), iPad (5th generation), iPad Air 2, iPad mini 4, and iPad mini 3 models with Wi-Fi + Cellular can use either the Apple SIM card or a carrier-supported nano-SIM card. The 12.9-inch iPad Pro (2nd generation), 10.5-inch iPad Pro, and 9.7-inch iPad Pro include an embedded Apple SIM card. iPad Air, iPad mini 2, and iPad mini models with Wi-Fi + Cellular use the nano-SIM card.
Available space is less and varies due to many factors. A standard configuration uses approximately 10GB to 12GB of space (including iOS and preinstalled apps) depending on the model and settings. Preinstalled apps use about 4GB, and you can delete these apps and restore them.