Insert a SIM eject tool into the SIM tray slot, and through a small hole in the mid frame.

Push the SIM eject tool through the hole and against the back cover to lift the cover slightly.

Insert an opening pick into the gap created with the SIM eject tool, and slide the pick around the edge of the cover to cut the cover's adhesive.

Cut carefully near the volume buttons, to avoid damaging the delicate ribbon cables in that area under the cover.

Remove back cover.