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Phones do not have enough spare battery power to be relaying messages on a mesh network.

phones probably spend 1/3 of a day (during night) being charged and plugged to the wall. You could have a mesh network that at any given time at least 1/3 of members is active - public key could have a timezone/timerange during what time note usually operates.

Phones spend almost all of their time charging next to the owners wifi router which is always plugged in. It just makes no sense at all to use phones as mesh nodes.

you still have to have back haul if you want to connect to the rest of the internet. If you want to make a mesh and do things locally with people on the mesh, and I certainly believe there is a place for that, this will work. If you want to mesh net your way out of a great firewall, you still have to find a point that has a connection to the rest of the world.

Did Google finally stop blocking ad-hoc Wi-Fi networks?