The slot for the SIM card in the iPad is on the side, toward the top of the iPad. The top of the iPad is the side with the camera. On iPads with a Home button, you can tell you are holding the iPad in the right direction if the Home button is at the bottom of the screen. IPads come with a SIM card removal tool.
How do I know if my iPad has a SIM card?
On all generations of iPad Pro, iPad Air, iPad Air 2, and iPad mini you can find the SIM slot on the bottom right side of the device, on the same side as the mute switch and volume buttons.
Does Apple iPad have SIM card slot?
If you purchase or have purchased an iPad Air that is Wifi and Cellular, it will have a sim tray for you to load in a sim card to be able to access 3G/4G networks. If the iPad is Wifi only, it will not have a Sim tray.