Meshtastic® is an open-source project using low cost LoRa radios as a long range off-grid communication platform in areas without little or no communications infrastructure. Build your own Meshtastic® compatible device using parts from RAKwireless or Heltec, or try an all-in-one device from RAKwireless or LILYGO. Paired with bluetooth device like a phone, you can send text messages to others without the need for a cellular network.