There are several efforts under way leading to a
store-and-forward digital radio network that would function as a
wireless Internet, able to provide emergency communciations in the
event of failure or overloading of the wired Internet, and able to
extend Internet communciations beyond the reach of wire links. You
should also do a search on "flexnet" or "amprnet" using any of
several WWW search engines.
A Proposal for a Wireless Internet of Portable Nodes
Free software you can install on your cellphone or laptop to
make it a wireless node in a mesh network.
Radio Network Seeking a network free of commercial
Internet service providers, governments, telephone companies,
and ad-hoc Internet regulatory bodies of dubious legitimacy
(such as ARIN and Internic).