Remove the battery cover, starting from the notch on the upper left side.
Remove the battery by lifting from the notch at the bottom of the battery compartment.
To remove the SIM card, slide it down out of the SIM card slot.
To insert the SIM card, slide it up into the slot as shown, with the gold contacts facing down and the notch at the upper left.
Slide the battery back in to the compartment, ensuring the gold contacts on the battery align with the terminals at the top of the device.
Replace the back cover, making sure to press it into place around the edges.
The SIM card has been inserted or removed.