As you work, try not to accidentally power on the phone. If you do, turn the phone off before resuming disassembly.

Place a suction cup near the bottom edge of the display.

Pull on the suction cup with strong steady force.

Press the edge of an opening tool straight into the frame seam near the suction cup until the edge wedges between the plastic frame and the back cover's lip.

Due to tight tolerances, this will take substantial force. Using a new opening tool with an unmarred edge will help with this step.