The SIM800L is a compact and reliable GSM/GPRS module designed for seamless integration into embedded systems. It enables voice, SMS, and data communication over quad-band GSM networks, making it ideal for IoT, remote monitoring, and automation projects. With its low power consumption and serial interface, the SIM800L is perfect for battery-powered and space-constrained applications.

Specifications

• Operating Voltage: 3.4V to 4.4V (recommended 4.0V)
• Current Consumption: Idle ~10 mA, Peak ~2A during transmission
• Baud Rate: 9600 bps (default, configurable)
• Antenna Interface: External antenna via IPX connector
• SIM Interface: Standard SIM card slot
• Operating Temperature: -40°C to +85°C

Features

• Quad-band GSM/GPRS: 850/900/1800/1900 MHz – works globally
• Supports voice calls, SMS, and GPRS data
• Integrated TCP/IP stack for internet connectivity
• Serial UART interface (3.3V logic level)
• Low power sleep mode (0.7 mA typical)
• Built-in Bluetooth 3.0 + EDR (varies by version)
• Compact form factor with onboard antenna connector
• AT command support for easy control
• Compatible with Arduino, STM32, ESP32, and other microcontrollers

Applications

• IoT and M2M communication
• Home and industrial automation
• GPS tracking and vehicle monitoring
• Remote sensing and control systems
• Emergency alert systems

Good guidance link: https://lastminuteengineers.com/sim800l-gsm-module-arduino-tutorial/