This has HUGE implications for communicating without internet, like in protest situations or natural disasters. Is currently available for download.
https://outline.com/CeF5NL
Hong Kong protestors are communicating via "a peer-to-peer mesh broadcasting network that doesn't use the internet." …
"The app can connect people via standard Bluetooth across an entire city, thanks to a mesh network. Chatting is speediest with people who are close, of course, within a hundred meters (330 feet), but you can also chat with people who are farther away. Your messages will simply "hop" via other Bridgefy users' phones until they find your intended target."
"While you can chat privately with contacts, you can also broadcast to anyone within range, even if they are not a contact."
[Moar at website]
For Android: https://play.google.com/store/apps/details?id=me.bridgefy.main&hl=en_US
For Apple: https://apps.apple.com/us/app/bridgefy/id975776347