Q. CABASA CR, A. CAMPECINO B, C. PORQUIS LB. Utilizing an Obsolete Mobile Phone as a GSM Modem for an SMS-Based Alarm System. TMF [Internet]. 2024 Mar. 26 [cited 2024 Sep. 20];20(1):185-202. Available from: https://journals.msuiit.edu.ph/tmf/article/view/251