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There are some groups building 'armageddon' mesh-based hand-held communicators like Meshtastic. Converged hardware is already there. The network probably is too in more and more metros if you're not within a few km of what you're trying to communicate with/track.

https://meshtastic.org

Map: https://canvis.app/meshtastic-map



There's also the helium network (https://explorer.helium.com/) which has a surprising amount of coverage, especially in urban areas.


This looks interesting, but device itself looks like it wouldn't survive fall on the floor, let alone armageddon. Just joking.


The case is up to you. I plan on using a plastic food jar :)




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