Something is wrong with my iphone

Liv and Eva, two sisters, are spending a quiet time at home. Everything seems normal… until Eva’s phone suddenly turns off. From that moment, something strange and unexplainable begins to happen. When Liv realizes that Eva has disappeared, she searches the entire house, but there is no sign of her. Only three mysterious knocks on the door break the silence. Who is on the other side? And most importantly… is Eva truly gone, or has she been trapped inside her phone?