Insert the nano SIM card with the contacts facing down.
Push the SIM card in and ensure that it locks into place.
Replace the battery.
Press the battery down to ensure the two battery latches engage.
Be aware of the orientation of the battery cover. Failure to replace the battery cover properly may damage the battery cover.
Align the tabs on the underside of the cover with the slot around the battery well. Make sure that the notch on the battery cover is at the bottom left cover of the device.
Carefully press down around the edge of the cover. Make sure that the cover is seated properly.