Remove the battery cover, starting from the charging port slot.
Remove the battery, lifting from the slot at the bottom of the battery.
To remove the SIM card, carefully slide it down out of the SIM card slot.
To insert the SIM card, carefully slide it up into the SIM card slot.
Insert the battery, making sure to align the gold contacts on the battery with the contacts on the device.
Reattach the battery cover, pressing around the edges to snap it into place.
The SIM card has been inserted or removed.