Q. CABASA, CHARLES RYAN, BERNARD A. CAMPECINO, and LOPE BEN C. PORQUIS. “Utilizing an Obsolete Mobile Phone As a GSM Modem for an SMS-Based Alarm System”. ASIA PACIFIC JOURNAL OF SOCIAL INNOVATION 20, no. 1 (March 26, 2024): 185–202. Accessed September 20, 2024. https://journals.msuiit.edu.ph/tmf/article/view/251.