SIM800L GSM/GPRS Module – Quad-Band Core Board with Antenna

SIM800L GSM/GPRS Module (Quad-Band, TTL Serial)

The SIM800L is a compact quad-band GSM/GPRS module that adds cellular connectivity to your projects — send and receive SMS, make and receive calls, and connect to the internet over GPRS. It communicates over a simple TTL serial (UART) interface using standard AT commands, making it easy to control from an Arduino, ESP32, Raspberry Pi or any microcontroller.

Features

• Quad-band GSM/GPRS: 850 / 900 / 1800 / 1900 MHz
• Send & receive SMS, voice calls and GPRS data
• TTL serial (UART) interface — controlled with AT commands
• Micro SIM card slot
• Onboard IPEX antenna connector (antenna included)
• Compact core-board form factor
• Works with Arduino, ESP32, Raspberry Pi and other microcontrollers

Specifications

• Module: SIM800L
• Bands: Quad-band 850 / 900 / 1800 / 1900 MHz
• Operating voltage: 3.4V – 4.4V (recommended ~4.0V)
• Interface: TTL UART (AT commands)
• SIM: Micro SIM
• Baud rate: Auto-baud / 9600 (configurable)

Important Power Note

The SIM800L needs a stable supply capable of delivering up to ~2A peak current at 3.4–4.4V. Do not power it from the Arduino 5V pin — use a Li-ion cell or a dedicated buck converter set to ~4.0V for reliable operation.

Applications

• SMS-based alerts and notifications
• Remote monitoring and IoT data over GPRS
• GSM-based home automation and security systems
• Call / SMS control projects

Package Includes

• 1 x SIM800L GSM/GPRS Module
• 1 x Antenna

Frequently Asked Questions

What power supply does it need?
A stable 3.4–4.4V source that can deliver ~2A peaks — not the Arduino 5V pin. Use a Li-ion cell or a buck converter set to ~4.0V.

Which SIM card does it use?
A micro SIM with an active 2G / GSM plan.

How do I control it?
Over TTL serial (UART) using standard AT commands.

Recommended Pairings

Works great with our ESP32-S3 board and Arduino Nano. Learn more about GSM networks.