I'd love to see a protocol designed for that sort of thing that hops from phone to phone without explicit intervention from the user.

No setting up a wifi hotspot and having people connect to you. No need to be connected to wifi at all. No fucking with Bluetooth.

I'm not even sure if there's a way to do it but that's what I really want. Carrying a separate LoRa device is just one more thing I'll forget to pack or charge.