2. It may be the setting in Nankai school. Teachers don't allow students to surf the Internet during school, and many students don't even surf the Internet on campus. 3. The signal in mountainous areas or low-lying areas of Nankai University is weak (no signal area). Nankai University, referred to as "Nankai", located in Tianjin, is a national key university directly under the Ministry of Education of People's Republic of China (PRC). It is a national "double-class" construction university, a national "2 1 1 Project" and "985 Project" key construction university, and selected into the national "Everest Plan" and "Strong Foundation Plan".