The SIM800C is a highly versatile and compact GSM/GPRS module developed by SIMCOM. This module has been widely used in various IoT devices, such as smart grids, vehicle tracking systems, wireless POS machines, and many more. With its compact size of only 17.6 × 15.7 × 2.2 mm, the SIM800C module is extremely easy to integrate into any device. It supports quad-band 850/900/1800/1900MHz frequencies, making it compatible with GSM networks worldwide. The module can also handle data communication, voice calls, SMS, and fax transmission, providing extensive functionalities. The SIM800C module has low power consumption, making it ideal for applications that require long battery life. It also has built-in Bluetooth and Bluetooth Low Energy (BLE) capabilities, enabling easy connectivity with other devices. Additionally, it supports SIM card detection, allowing hot-swapping of SIM cards without powering down the device. Overall, the SIM800C module offers a reliable and cost-effective solution for IoT and M2M applications, providing seamless communication over GSM/GPRS networks.