I'd like to note that I studied to become a writer. I wrote novel, short story, mainly thriller. I consider myself lazy to write this kind of thing, never wrote a review, but now here I am. I want to encourage writers and authors to watch this movie and learn from it. The Call, for me, one of the best stories ever written. So well made.

In literature especially for thriller, there's a concept called "stake". Basically, it means that the protagonist, who has a goal, encounter the antagonist who disrupts the goal, and the antagonist threaten the protagonist so that the protagonist has no choice but to pursue the goal.
This may sounded complicated, but listen. Most of the stories out there forget this thing. They write the protagonist need to pursue his/her goal because it's the goal, some sort of ambition. Wrong. Writers need to set the stake, for example, if the protagonist fails to reach the goal, they will die, or somebody die.

One thing that I'd like to note about The Call is there are no scene that useless. I hate this kind of useless scene. Most writers often uses scene for a simple "dramatic effect" that actually so silly. They fails to realize that those scene are garbage.
A scene must have one important key, "progression". Something yearns to progress. Either a new information, character development, relationship, etc. Two types of scene: action scene and reaction scene. Not trying to be a nerd with this but I analyzed everything in The Call, and it followed the basic theory of 27 structure.

This is how you write a story. All of the directors! Writers! whatever, watch this thing. Watch this. Learn.

"Oh, that concept of time paradox is very common."
Bro, shut up. I don't care about the theme. I'm not talking about the theme. If it's mainstream, so be it. I don't care. I watched lots of movie with great concept, big potential, but ended up as a waste, a dogshit.

Good or bad writing in movie is a preferences. But, correct or wrong writing in movie is a fact.

Spoiler:
It's just that police's death that felt off to me. That probably the only one plot hole nonsense in the story. Also, I felt it silly when the antagonist manages to avoid getting caught, somehow. I mean, starts from she killed her mom, especially when she killed the strawberry guy, it obvious that the police should know about this. However, they didn't. And it made the police looked dumb, disappointing the viewer and also insulting the viewer.
I think what should be done is the writer should create the antagonist more organized, not impulsive like that. This made the antagonist appeared smart, and the viewer would respect her and more scared to her. I mean, seriously? She killed the strawberry guy like it was Tuesday and the police really that one of an imbecile?