Insert a putty knife or opening tool into the seam between the phone's back cover and front cover.

Run the opening tool along the seam to loosen the back cover.

It may take quite a bit of prying and wiggling to remove the back cover.

Open the back cover slightly so that you can see the flex cable connected between both halves of the phone.

The flex cable connects towards the top of the phone near the front-facing camera. To avoid tearing the cable, pull the back cover off gently.