Description
A GSM (Global System for Mobile Communication) module is a compact communication device that allows microcontrollers and embedded systems to connect to cellular networks. By inserting a SIM card, the module can send and receive SMS messages, make and receive voice calls, and establish GPRS/Internet connections. Commonly used with Arduino, ESP32, and other controllers, GSM modules like SIM800L, SIM900, and SIM808 are widely used in IoT, security, home automation, GPS tracking, and remote monitoring projects. They operate on standard mobile frequencies (850/900/1800/1900 MHz) and communicate with controllers through UART (serial communication). GSM modules provide a reliable and cost-effective way to achieve wireless communication in electronics projects.
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