Power down the phone.

There is a screw located inside the 3.5mm headphone jack that needs to be loosened. Use a Torx T5 screwdriver for this.

The screw does not come out. Once loosened, It will unlock the lock bar inside the phone. You will break it if you do not complete this step properly.

Remove the sim card tray on the top of the phone.

Remove the 4.5 mm Torx T5 screw highlighted with a red circle in the picture. (Note: all screws that you will remove in the phone will be the same)

There is a sticker located on the screw that needs to be peeled off. This voids your warranty.