![Adafruit FONA 3G Cellular Breakout - American version [Without Free Ting Sim Card] - Adafruit - 2687](/_next/image?url=https%3A%2F%2Ftfvg9prl3arlawj9.public.blob.vercel-storage.com%2Fparts%2Fcatalogue-visuals%2Fpublic-missing-line-art-20260602%2Fadafruit-2687-adafruit-fona-3g-cellular-breakout-american-version-f251baf78caa-ly3k77BxTL1bh8RQOg8ihc8gmNVa8v.png%3Fv%3D0.1.26&w=3840&q=75)
3G cellular modem breakout for US bands with GSM backwards-compatibility, designed for data and voice projects requiring cellular connectivity.
| Pin | Type | Voltage |
|---|---|---|
| Vio | Power | 3-5V |
| Key | Control | pulse to GND |
| 5V | Power | 5V |
| PSNS | Unknown | Vio logic |
| Reset | Control | active low |
| RXTX | UART | Vio logic |
| RTSinCTSoutDTRRI | Control | Vio logic |
| SPK+- | GPIO | speaker drive |
| MIC+- | GPIO | 2V mic bias |
UART · USB · Breakout
Verify supply voltage and logic levels before powering up.
Module pins: 5V, RX/TX. Schematik maps them to your board in the app.
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