Islamiyati Nursyamsi, and Abdurrahman Iskandar. “Analysis Of Whatsapp Voice Call Quality On 3G And 4G Networks”. International Journal of Health Engineering and Technology 5, no. 3 (September 8, 2026). Accessed September 10, 2026. https://afdifaljournal.com/journal/index.php/ijhet/article/view/887.