... ubiquitous, particularly among high school students, and cell phones becoming more and more sophisticated, tempers run high when it comes to students, schools, and cell phones” (Katharine Saw, ... my thesis including: questionnaire survey and existing information. 3.1.1. Questionnaire survey: this method was used to investigate the real situation (How, When, Where and what for the pupils ... of questionnaire survey was appropriate to research objectives or not. As the result, survey design was a little amended and improved. On May 7, 2010, an official survey of Thuong Tin high school...