In fact, there is nothing difficult to understand at the end. Since the second female received a call from her future self, then her future self must be alive. She only needs to complete the action of calling her past self, then the entire timeline will form a closed loop. There is no possibility of modification.
That is to say, even if the heroine's mother kills the second girl or even chops the second girl, it is useless, because the fact that the second girl will never call in the future will erase everything. That is to say, the modification function of the phone is not one-way. For a long time, what the audience sees is that the heroine calls the second girl, and the second girl changes the past to change the future.
But in fact, time has no direction. Many people do not realize that the constant is the phone and the people who use it. When the heroine is holding the phone, no matter what the second girl does, it is impossible to erase the existence of the heroine.
For example, if the second woman kills the heroine when she is a child, the fact that she has received a phone call from the heroine will not change, and the call will force the timeline back to the situation where the heroine survived.
In fact, it is very likely that the second woman has tried to kill the heroine many times, but since the heroine has called in the future, the timeline does not admit any circumstances of the heroine's death as a child.
All in all, only what happens on the phone is the truth, everything else can be modified, and everyone just follows this principle.
So you should actually watch the whole film in reverse. The two facts with the widest time range are:
1. The second woman made the wrong call to the hostess in the past
2. The second female will call herself in the future
Everything else in the film is designed to satisfy these two facts.
Because the second woman called the heroine, the phone must have the function of communicating across time.
Because the second girl made a phone call in the future, the phone must have the function of changing history so that the second girl can live.
Because the second girl told herself to come back in the future, the heroine must have defeated the second girl in the past.
The two facts of earliest and latest are the biggest and most absolute, the others can be ignored, and even the capabilities of the phone itself are not as important as these two facts.
From this point of view, it makes perfect sense to say that the film is a psychotic delusion of the female second.
The unreliable narrator is the key to the whole puzzle.
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