Build Season 2026 is live: Publish a build to win M5Stack hardwareBuild Season 2026 is live

Adafruit FONA Mini Cellular GSM Breakout (SIM800)

Adafruit FONA Mini Cellular GSM Breakout (SIM800) — Adafruit — 0704256797669

Compact quad-band GSM breakout (850/900/1800/1900 MHz) based on the SIM800, supporting voice, SMS, and GPRS data over UART at 2.8–5V logic. Includes FM radio, LiPo charging, and a headphone jack; requires an external SIM card and battery.

Pinout

Logical pinout · physical placement not verified
ADAFRUIT FONA MINI CELVioRIVBATSPK+GNDSPK-KeyMIC+PSMIC-NSPWMResetBuzzerRXADCTX5V
  • Vio
    Type · Power
  • VBAT
    Type · Power
  • GND
    Type · Ground
  • Key
    Type · Control
  • PS
    Type · Signal
  • NS
    Type · Signal
  • Reset
    Type · Control
  • RX
    Type · UART
  • TX
    Type · UART
  • RI
    Type · Signal
  • SPK+
    Type · Signal
  • SPK-
    Type · Signal
  • MIC+
    Type · Signal
  • MIC-
    Type · Signal
  • PWM
    Type · PWM
  • Buzzer
    Type · Control
  • ADC
    Type · Analog
  • 5V
    Type · Power

Start wiring

UART · USB · Breakout

Verify supply voltage and logic levels before powering up.

Module pins: Vio, VBAT, 5V, GND, PS, NS, RX, TX. Schematik maps them to your board in the app.

Cellular

57 other options

Adafruit FONA GSM breakouts, the Gravity Air780EU 4G Cat 1 module, Dragino NB-IoT Shield-B8, Pycom FiPy, Quectel and SIMCom M.2 5G modems, and the RockBLOCK 9603 Iridium modem each target a different network tier.

View all 57

Related groups

4 groups

Bluetooth

BLE 5-era modules (nRF52840, MDBT50Q), XIAO MG24 boards with Matter-over-Thread, Bluefruit UART/SPI bridges, HM-11 serial modules, and BLE sniffers cover different jobs and different hosts.

Wireless & comms · Bluetooth modules · 71 parts

GNSS & GPS

Adafruit Ultimate GPS (PA1616S/PA1616D), NEO-6M and NEO-M9N u-blox breakouts, Gravity GNSS BeiDou boards with I2C/UART, and 4G or LoRa RTK kits — accuracy and constellation requirements split them.

Wireless & comms · GNSS & GPS · 68 parts

LoRa & RF

RFM95W and SX1262 LoRa transceivers, Wio-E5 LoRaWAN modules, SX1302 gateways, Digi XBee mesh radios, 433 MHz ASK serial links, Dragino IoT sensor nodes, and the SDRplay RSP2 wideband SDR receiver.

Wireless & comms · LoRa & RF modules · 94 parts

Networking

ESP8285, ATWINC1500, and EMW3060 Wi-Fi modules; the WIZ5500 Ethernet co-processor; the DP83848 RMII PHY board; 802.11n USB adapters for the Pi; and an XBee USB configuration adapter.

Wireless & comms · Wi-Fi & networking · 26 parts