How to Add SIM Cards to a Wi-Fi iPad
Adding a micro-SIM card to a 3 G-enabled iPad allows you to access the Internet over the SIM card provider's wireless cellular network. An iPad that can accommodate a micro-SIM card has a built-in SIM tray that allows you to insert the SIM card into the device safely. A micro-SIM card is a small version of a regular SIM card. Although it is smaller, it can still access a cellular network to transmit and receive data just like a regular card.
Locate the micro-SIM tray on the upper left-side of the iPad.
Insert the tip of the iPad's included SIM eject tool or the end of a straightened paper clip into the SIM tray's hole.
Push the tool firmly into the hole until the SIM tray automatically ejects.
Pull the SIM tray out. If applicable, gently remove the old micro-SIM card from the tray.
Place the new micro-SIM card into the tray. The micro-SIM card has the same shape as the inside of the tray. Orient the new micro-SIM card so that it fits in the tray.
Push the SIM tray back into the iPad.