If other people have this issue, I would try supergluing a screen protector over the old screen - leave a wide margin around the edges, home key, ear speaker. You could even just cut a piece of the protector into a square, or get a rectangle of shipping tape, the glued down portion needn't cover the whole screen. Then, glue the suction cup on top of the glued down screen protector or tape. I suggest this over the utility knife because it seems like the knife method would at the very least scratch up and nick the frame.
I suspect that the age of the phone and accident that caused cracks make this method possible for some people. My mom's phone was only a month or so old and the suction cup only caused the screen to raise slightly. There was certainly no crack I could squeeze a spudger into. I just superglued the suction cup onto the screen in the end, which was very effective.
Однажды Они, Вы смогут просмотреть график вашего рейтинга, накопленного за всё время.
Репутация еще не заработана.