Once the screen is warm to the touch, apply a suction cup to the lower edge of the phone.

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.

Lift on the suction cup, and insert a halberd spudger or an opening pick under the display assembly.

Start to slide the halberd spudger/opening pick along the lower edge of the phone to cut the adhesive. Leave an opening pick at the corner to prevent the adhesive from resealing.

Continue to slide the halberd spudger/opening pick along the side of the phone and insert another opening pick.