The number of people using the internet in Indonesia is growing, especially among students. Smartphones are the most widely used devices for students to access the internet. Smartphones can be installed with a variety of applications that provide both positive and negative information. This article investigates the correlation study and affecting factors for smartphone use and religious practices. The research sample consists of students at State Madrasah Aliyah in Bekasi City. The research shows that WhatsApp and Instagram are the most dominant social media platforms being used at the moment, while most respondents are also studying Koran on their smartphones. Islamic content, such as Islamic news, knowledge, and movies, is also among the most accessed content. Some social media sites have a significant negative correlation, while Islamic applications and contents are proven to have a positive correlation towards religious practice. Parents' and school policies' limiting smartphone use have proven effective in increasing religious practice. Recommends the urgency of a literacy strategy by the government, which includes content restrictions and digital literacy to improve students' religiosity.