ipad 2 Also have Micro sim card like iphone 4,The micro-SIM card in some iPad Wi-Fi + 3G models is used for cellular data. It’s also known as a third form factor (or 3FF) SIM. If your micro-SIM card wasn’t preinstalled or if you change cellular data carriers, you may need to install or replace the micro-SIM card.
Follow the Below Given Step to Insert Sim card in ipad 2:
Step 1 : First insert the tip of the SIM eject tool in to the hole on the SIM tray.
Step 2 : Now pull out SIM Tray and insert your SIM Card.
Step 3 : Now Push back your ipad 2 SIM Card Tray and reboot your Device.
That’s it You have successfully insert Sim card in ipad 2.