Adafruit FONA 800 Shield - Voice/Data Cellular GSM for Arduino

The Adafruit FONA 800 Shield brings 2G cellular connectivity directly to your Arduino in a convenient shield form factor. Built around the SIM800 quad-band GSM module (850/900/1800/1900 MHz), it provides voice calling, SMS messaging, GPRS data, and even FM radio reception — all controlled via AT commands over serial.

The shield plugs directly onto any classic Arduino or compatible board and includes LiPo battery charging with a power switch, level shifting for Arduino-safe operation, a TRRS headphone jack, and a uFL antenna connector. A vibration motor driver is also built in for silent notifications.

Key Features

• SIM800 Quad-Band GSM – 850/900/1800/1900 MHz for global 2G network connectivity
• Arduino Shield Form Factor – Plugs directly onto Arduino UNO and compatible boards
• Voice, SMS, and Data – Make/receive calls, send/receive SMS, GPRS data (TCP/IP, HTTP)
• FM Radio Receiver – Built-in FM broadcast scanning and reception
• LiPo Battery Charging – On-board charger with power switch; charge status LEDs; requires 500 mAh+ battery
• Level Shifting – Arduino-safe logic level conversion built in
• uFL Antenna Connector – For external GSM antenna
• TRRS Headphone Jack – Standard 4-pole jack for Android/iPhone-compatible headsets
• Speaker + Mic Breakouts – Pads for external 8 Ω speaker and electret microphone
• Vibration Motor Driver – PWM/buzzer output for silent notifications
• AT Command Interface – Auto baud detection

Also Available

• FONA 808 Shield – Mini Cellular GSM + GPS for Arduino (with GPS)
• FONA Mini Cellular GSM Breakout – uFL Version
• FONA Mini Cellular GSM Breakout – SMA Version
• FONA 3G – European Version (3G + GPS)

Required Accessories (Not Included)

• Arduino UNO or compatible board
• 2G mini SIM card
• LiPo battery – 500 mAh or larger
• External uFL GSM antenna

Ideal For

• Adding cellular connectivity to Arduino projects
• Voice and SMS-enabled devices
• Remote data logging over GPRS
• IoT prototyping with Arduino

Package Contents

• 1× Adafruit FONA 800 Shield (assembled and tested)
• 1× Stick of 0.1-inch male header (soldering required)