“Rajit Gadh of the University of California, Los Angeles says the research points the way towards truly cheaper or even free mobile telephony. “Ad-hoc networks are a fantastic opportunity for voice,” he told New Scientist. “Within a city, with enough nodes, this could provide a secondary network for people to make calls.” Such a network could function outside of VoIP or connect to it via internet access points, he says….”
An interesting article about the potential usage of ad-hoc networks for smoother calls. You can find more details here.