They probably will throttle or shut off cell tower service. I’ve heard of mesh networks that use Bluetooth instead of relaying your messages to a cell tower. Is anyone experienced with any of these apps? Bridgefy looks like a decent mesh network messaging app.
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I posted earlier that I think everyone should go in groups and buy a walkie/two way radio for everyone in the group for this very reason. Not sure blue tooth will be very reliable.
Bluetooth turns your phone into a walkie talkie. You can create a mesh network with it.
Most Bluetooth doesn't even go as far as Wifi, so you need a really dense mesh of people who are all part of the network.