Locate the notch in the back of the phone.

Use your thumb to push up on the notch, separating the back half of the phone from the keyboard and screen in the front.

Slide the opening tool in between the two halves of the phone.

Continually apply upward pressure with the opening tool to pop the back casing off of the main body.

Set the back casing aside and out of the way.

You should now have five parts: The battery cover, the battery, the screws, the back casing, and the main body of the phone.