If it's just the signal plus the butterfly effect, it doesn't seem to be interesting. The signal is about connecting two good people with a phone to solve a crime, but the movie called the phone uses another possibility. What if the bad guy is connected? There are many details in the movie that the director did not fully unfold. The last scene actually appeared in the movie, and there are many similar scenes, but the director did not fully unfold it. I believe that the last scene is where the director inspires the audience to explore more possibilities. Obviously, this idea has been achieved.
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