This study analyzes the effect of mobile phone usage on the academic performance of Grade 11 students at Lucena National High School in Lucena, Philippines. A questionnaire was provided to 32 Grade 11 students to understand how mobile phones affect their studies. The findings suggest that mobile phones can positively impact student performance by making schoolwork easier to research, but can also be a distraction in class. While some students feel mobile phones help their grades, others believe it harms their performance. The study concludes mobile phones both help students learn as well as negatively affect their knowledge retention and focus. Recommendations include further research on self-management strategies and how mobile applications influence student achievement.