We all know Signal, Matrix, Telegram, SimpleX, etc… But if you can’t access the internet you can’t communicate. Pretty logic. But would it be possible, at least theoretically, to create an app that permits to message people even if the internet goes down?
It might be a dumb question I really have no idea to be honest.
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This was a common thing that was developed for the international protests after Arab Spring, which would frequently have their Internet shut down as a State tactic to prevent communication amongst protestors.
Mesh net chat apps like FireChat were born in response
https://en.m.wikipedia.org/wiki/FireChat
Edit: apparently wikipedia says it wasn’t developed for protests, it just happened to be released at the same time