Apply a suction handle to the center of the bottom edge of the rear glass, as close to the edge as possible.

If your display is badly cracked, cover it with a layer of clear packing tape to help the suction cup adhere. Alternatively, you can pull using very strong tape instead of a suction cup. If all else fails, try supergluing the suction cup to the broken screen.

Pull up on the suction handle with strong, steady force to create a gap between the rear glass and frame.

Insert an opening pick into the gap.