This study intends to investigate PHS phone and its application in an elementary school. The interview process targeted on the projector who directed the plan of PHS phone from an experimental elementary school located in Kaohsiung County, southern Taiwan. She joined all of digital experimental project and observed interaction between the parents and their own children in that specific elementary school. In the experimental period, the projector observed each parents using a PHS phone through message transmission and mobile net communication, and the parents discussed and shared feelings with the teacher and other parents through using PHS phone. The research summarized the projector’s ideas and provided references opinion information to instruction designers and mobile learning projectors to develop further innovative instruction.