Who are the main characters in 'the blackphone short story'?

Since I don't know the exact story, I can't say for sure. But it could be a young person who finds the blackphone, and perhaps there is an antagonist who is somehow related to the secrets of the phone.

Without having read the 'blackphone short story', it's difficult to name the main characters precisely. However, it's common in such stories to have a central character who is drawn to the blackphone for some reason. This character could be a curious teenager or an inquisitive adult. There might also be a character who represents the danger or mystery associated with the phone, like a mysterious stranger who seems to be watching every move related to the blackphone. And there could be supporting characters, such as family members or neighbors, who either help or hinder the main character's exploration of the blackphone's secrets.