We are a bunch of audio and conversation enthusiasts in the heart of Switzerland 🇨🇭, dedicated to creating virtual audio experiences that feel like the authentic in-person conversations we all value so much. We believe the right conversation at the right time changes everything. That's what drives us. 😊 Try it out and let me know if we can support you! ✌️. - Source: dev.to / over 2 years ago

I would opt for the serval project [1]. Having a mobile based mesh network facility that is not controlled by neither corporations nor governments is of paramount importance imho. [1] https://servalproject.org/. - Source: Hacker News / over 1 year ago

Check out mesh networks like Serval http://servalproject.org/ which may help with your backup comms. Source: over 1 year ago

This app was used to organise protesters in Kuala Lumpur. They anticipated the government would shut down the cell network…which they did. As I understand it (I cannot find the article about it) several thousand people used this application on their android phones to communicate during the protest without internet or cell service…it creates a phone-to-phone network. I don’t know if it is still downloadable. The... Source: over 2 years ago

Http://servalproject.org/ It's a way for devices to talk to one another without paying for a service. Look for Mesh networks in your area, they provide free service. You can also make yourself a mesh node or support to help spread it. Source: almost 3 years ago

You can also use Mesh services on your phone even if you don't have a sim card. http://servalproject.org/ When my kids were younger we had them all using Serval Mesh for a long time to stay in contact with one another and such but we were fortunate to live in an area with an abundance of free WiFi just about everywhere so it was used sparingly but came in handy in a pinch. Add that with Google... Source: almost 3 years ago