The increasing intensity of smartphone use by students will of course have a number of impacts. This paper examines the impact of smartphone use on student addiction and social interaction at Madrasah Aliyah Negeri 1 Tangerang Selatan City. This paper is the result of research conducted in 219 with qualitative methods supported by quantitative data. The results showed that 15.7% of students who use the internet for 7-9 hours a day, and 18.7% of students who use the internet more than 9 hours a day, have a tendency to become addicted to smartphones. In addition, the social interaction of students who are indicated to have smartphone addiction is still relatively good. This is indicated by their frequent activities using smartphones such as playing games and watching movies together. They also tend to be compact in sharing quotas and lending smartphones to friends who need them.