Fake phone app that looks exactly the same. Or literally just a video. Or even just visual effects, with the phone being a green screen.

For 911 calls, and most calls actually, they almost never show the screen of the phone being dialled anyway. They just show the actor tapping at the phone vaguely while the camera shows them from the side or the back with an intense expression, and then suddenly they hold it up to their ear and then they act like they're talking to 911.

And if for some reason they really do have to show the screen, they will just use a non-functional phone with a fake app or graphical effects in post-production, the same way they make ghosts and dragons appear and spaceships come crashing out of the sky, etc. A phone screen is a trivial effort to fake.

Movie Magic

They could just not show them pushing the buttons. Just go "beep boop boop" "hello 911 what is your emergency"

No idea if this was used for any film, but you may make your own GSM "tower". Though it needs to be powerful enough that the phone won't decide to roam to something else, and that might be a regulatory issue.

Also could use a fake phone app. Or a fake phone...

But ICE comes for you because you are on a list, not because you trustingly followed someone to their car or something. They hunt you; they don’t lure you. It doesn’t matter if you trust or distrust them; the result will be the same.