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Meet the goTenna Pro X: an off-grid mesh networking device that lets you send mobile messages to others without a WiFi, cellular, or satellite service. It is designed for the pros in the field in tactical situations. The goTenna Pro X can operate on any frequencies in 142-175 MHz (VHF) & 445-480 MHz (UHF) ranges. It lasts up to 30 hours on battery and has end to end encryption.
You can use this device with any smartphone. More info is available here.