Instructions on inserting/removing your SIM can help with activation issues/errors, browser connection problems and a blank/frozen screen.
Don't attempt to remove the SIM card while the device is powered on. Doing so may harm the SIM card and/or the device.
Ensure the device is powered off.
From the right or left edge of the device (depending on the model), remove the SIM card tray.
Refer to iPad SIM removal for illustrated instructions based on the model of the iPad.
Utilize the SIM eject tool (or paperclip) to unlock the tray by inserting it into the provided slot.