GSM/GPRS Support – Can make calls, send/receive SMS, and connect to the internet.
Quad-Band – Works on 850/900/1800/1900 MHz frequencies.
Small Size – Compact module suitable for embedded IoT applications.
Low Power Consumption – Operates at 3.4V–4.4V (typically 4.0V recommended).
Serial Communication – Uses UART (TX/RX) to interface with microcontrollers like Arduino, ESP32, and Raspberry Pi.
Integrated TCP/IP Stack – Supports HTTP, FTP, and MQTT for IoT applications.
VVC:3.7V-4.2V
GND:Ground
TXD:UART Transmit
RXD:UART Receive
RST:Reset (Active Low)
DTR:Sleep Mode control

Power Considerations:

SIM800L requires a stable 4V power supply with at least 2A peak current, as it draws high power during network operations. Using a step-down module (e.g., AMS1117-3.3V is not suitable) is recommended, or a Lithium-ion battery (3.7V) for best performance.

Applications:

IoT projects
Remote monitoring and control
Home automation
GPS tracking (when combined with a GPS module)
Emergency alert systems