Safe. Because free health lectures belong to public welfare projects, in order to improve people's health awareness, binding mobile phones can facilitate the notification of future health lectures, so binding mobile phones is safe. Health education lectures are mainly to popularize health knowledge and tell us the health knowledge that should be paid attention to in daily life. The contents mainly include the publicity and popularization of China Citizens' Health Literacy-Basic Knowledge and Skills, health education for residents, health education for key populations, health education for key chronic diseases and infectious diseases, and health education for public health issues.