Based on the iPad model, refer to these diagrammed instructions to determine the SIM tray location.
Inserta la herramienta para expulsar la tarjeta SIM (o un clip) en la ranura correspondiente para destrabarla.
Insert the SIM into the SIM card tray.
To insert the tray and SIM back into the iPad, align in slot and press in on the tray to lock it into place.
With the iPad screen facing up, the SIM card tray is inserted with the SIM ID on top and gold contacts facing down.