Solar trickle + LoRa long-range + drone relays + emergency-priority broadcast keep people reachable when the grid, towers, and internet are gone.
Grid-independent
Solar backplate + multi-day battery survives extended blackouts.
Tower-independent
Direct device-to-device links keep working when cellular is down.
Shutdown-resistant
No central control plane to seize or block.
Authority broadcast
Signed emergency packets flood with QoS preemption.