my friend watched it as a kid in around 2006-2007, it’s most likely an old film.she remembers a few scenes:in the beginning a group of friends is riding in a car probably at night when one of them gets a phone call and jumps out of the window and dies;another scene- a woman w black long hair gets a phone call as well and all the other friends warn her not to answer but she does answer and proceeds to stab herself in the stomach w knives and other kitchen stuff; in the end a few friends who stayed alive are surrounded by zombies or smth, the other friends died one by one when answering those phone calls.

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