This study investigates the effectiveness of integrating smartphone technologies, including QR codes, audio textbook capabilities, and mobile apps, to enhance personalized learning and language acquisition skills among intermediate-level ESOL learners. The research involved ten participants from diverse linguistic backgrounds, employing semi-structured interviews and direct classroom observations. Data were analyzed using thematic analysis to identify key impacts on pronunciation, learner autonomy, and engagement. Findings revealed significant improvements in pronunciation, stress, and intonation, facilitated by audio aids. Participants reported increased confidence and reduced anxiety when engaging in classroom activities, alongside enhanced autonomy through the ability to customize their learning pace. The study highlights the transformative role of Mobile-Assisted Language Learning (MALL) in creating flexible and inclusive language learning environments. Implications include the need for integrating personalized digital tools into ESOL curricula and addressing challenges such as digital literacy and equitable access. Future research should explore advanced technologies and long-term impacts of MALL applications.