Children start using smartphones increasingly from early ages. This makes it more difficult for them to develop an understanding of online privacy and managing their personal data. Many parents monitor and regulate children's online media use. However, they also encourage using smartphones to ensure the safety and security of their children. This study explores how children use smartphones in relation to their understanding of privacy of communication, content, data, and location. It examines data from 7 focus groups with arts-based methods conducted with 37 children in UK. The findings suggest that children think of their smartphones as a private communication technology and a private place, and they manage their locational privacy based on the necessity of using a mobile app and through adjusting the location settings on their phones. The findings also suggest that privacy of mobile data and user content are dependent on where mobile communication takes place. © 2022 The Author(s). Published by Oxford University Press on behalf of International Communication Association.