Make a modular dumb phone from FPGAs (like TinyFPGA, Lattice iCE40, or something open source), an open RISC-V core (like VexRiscV), keypad and screen (non-touch), run it on a Linux kernel to send texts over the LoRa network and possibly do other things. No proprietary baseband or Wifi hardware. That's the only "safe" cell phone there is because cell networks are paywalled, proprietary (rely on baseband), and are heavily monitored and controlled by the FCC.
>>32672Or hell, instead of Linux, use RTOS or bare metal.