If everyone just opened up their wifi router, we wouldn't even need transmitters, towers, etc. Anything the wireless carriers provide you, you can do over the net. There are some issues like transparent handovers, but I'm sure people can make software to work around it. There were some startups back in the day that were going to give wifi routers to everyone so you can sell your bandwidth and people would be able to access the net from everywhere. Whatever happened to those?