Blockstream runs a satellite service (https://blockstream.com/satellite/) that broadcasts blocks. So if you have a satellite receiver, you can sync to the blockchain without Internet access. For the user, it's receive-only: you still need some way to send transactions. I think a bitcoin transaction should be able to fit into SMS. Does anyone know of a service that will broadcast bitcoin transactions to the network that it receives over SMS?
send hex or base64 transaction to +1 (863) BIT-COIN
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This is good, but a service like this would need to be set up in every country because of international charges that would otherwise be incurred
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My blogpost is essentially a how-to so anyone can learn how to make the service available in their country.
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There are concepts and working services but the main issue with SMS is the limitation on national level. At this point is better to leverage the EDGE network
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I think the solution you're looking for, is actually to establish internet, but maybe a network that's dedicated to Bitcoin transactions? Anyway, look here: https://www.althea.net/
You're going to want to look at UHF for long haul communications, and long distance WiFi extenders if the haul is only a few miles.
For shorter distances, you'll want this: https://www.instructables.com/LoRa-Mesh-Radio/
If you happen to be working with a community that doesn't have internet access like the Central African Republic for example, these projects are the way to go. Its just, internet citizens such as ourselves have a hard time getting this information to people who aren't on the internet.
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That would be huge
Keep in mind sending transactions over SMS is not private.