How did Phyllis text his father?

Smart watch. According to the story of Destiny's Stone Gate, Phyllis wore a smart watch on her wrist when she was kidnapped, and secretly sent a text message to her father when the kidnapper was not looking. Doors of Destiny tells the story that Okabe Rintarou (voiced by Mamoru Miyano), the hero of this novel, is a college student suffering from serious middle school diseases. He and his partners who call themselves "the fierce truth in Phoenix College" formed the Institute of Future Invention.