Overall, "Karthik Calling Karthik" is a heartwarming film that explores the complexities of human relationships. If you're a fan of romantic dramas, you might enjoy this movie.

"Karthik Calling Karthik" is a gripping thriller that explores themes of identity, self-discovery, and the human psyche. The movie's suspenseful narrative keeps you engaged until the end. While it received mixed reviews from critics, it has its fans who appreciate its unique storytelling.

: It is eventually revealed that Karthik suffers from schizophrenia; the mysterious caller is actually a pre-recorded version of himself that he creates while in a dissociative state.