A joint research project between Aalto University School of Business, in Finland and the Center for the Studies of Information Resources, in China explored the impact of smartphone use on a number of indicators: academic performance, sleep, nomophobia (fear of being unavailable to mobile phones), and behaviour.
Based on a survey of more than 10,000 college students, the study found that the use of mobile learning and news applications improved academic performance and reduced nomophobia, however playing mobile games, as well as using social media, music and video, and entertainment book-reading applications negatively impacted both academic performance and sleep.
You can find the full article at:
Lin, Y., Liu, Y., Fan,W., Tuunainen, VK, & Deng, S. (2021). Revisiting the relationship between smartphone use and academic performance: A large-scale study. Computers in Human Behavior, 122, p. 106835.