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A Swedish company has made a phone that uses peer-to-peer routing of calls, without the need of a cellphone tower. This ad-hoc network like way of communicating may allow you to make free calls since you will not have to pay the phone company for giving you a network. This could also spell the doom for GSM network and cellphone companies.
http://news.bbc.co.uk/1/hi/technology/6987784.stm
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