This idea will only work in urban centres. Give cellphones "walkie-talkie"-like functionality so that the network can be bypassed. Maybe this is what bluetooth does already, I'm not sure. I want to call Joe, so my cellphone sends out an encrypted message which is picked up by cellphones within a certain radius. If Joe isn't in that radius, strategically chosen cellphones (ie. by location, to provide largest radius) echo the call to other cellphones within different areas until Joe is found (or not). Then a secure path between a few cellphones can be used for Joe and I to talk, without any of the other cellphone users being aware of it. This type of feature could be used when the cell network is down, or perhaps at any time at reduced costs.
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It would work anywher, except it would possibly be technically complex to include such a transmitter in a phone, plus some providers are selling "walkie-talkie" mode as a service for their customers.
Just get two walkie talkies.If air was sold in bottles would you forget how to breathe?
Didn't some cell phone company try this 4 or 5 years ago...?
Cell phones wouldn't be able to carry that sort of bandwidth.
This is called "Push to talk" technology. Service providers should enable this service. which they will not do. Other wise they loose thir market :)
The concept is close to "sensor networks" in computer networks. If you want to pursue this idea, I suggest read the research done in that area.
Something like skype does? good idea, it would be spread instead of centralized