The 2023 Common Sense Media report, Constant Companion, offers a detailed look into how U.S. teens use smartphones over a typical week. Drawing from real-time data and youth feedback, the study reveals that smartphones are deeply embedded in young people's daily lives, serving as tools for connection, entertainment, and emotional support. Teens receive a median of 237 notifications per day, often during school and nighttime hours, and use their phones for an average of 43 minutes during school. While smartphones help some teens relax or fall asleep, they also contribute to delayed bedtimes and disrupted sleep. Many teens are becoming more aware of persuasive app designs and are trying to set boundaries, but the business models behind these technologies often undermine those efforts. The report calls for more support from families, educators, and industry leaders to help youth build healthier relationships with their devices.