Once the screen is warm to the touch, apply a suction cup near the top edge of the phone right under the earpiece speaker.

If the phone's screen is cracked, the suction cup may not stick. Try lifting it with strong tape, or superglue the suction cup in place and allow it to cure so you can proceed.

Pull up the suction cup to create a gap between the screen and the display bezel.

Insert the tip of an opening pick in the gap you created and slide it to top right corner of the phone. Leave it there to prevent the adhesive from resealing.