AI-Based Multimodal Biometrics for Detecting Smartphone Distractions: Application to Online Learning - Becerra, Alvaro; Daza, Roberto; Cobos, Ruth; Morales, Aythami; Cukurova, Mutlu; Fierrez, Julian (Two Decades Of Tel. From Lessons Learnt To Challenges Ahead. Ec-Tel 2025, 2026)