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intercom using cell phones

is it possible to use the phone without a sim card or change the frequency at which the mobile communicates.. actually what i want to do is use a couple of cell phones or more to communicate between each other over a short range without using any service provider, i am ready to buy/make a kit which can work as a kinda service provider between those two or more mobiles in a certain region.. say of radius 300-500m......

on more larger scale.. i want to set up a kind of inter-com system using cell phones which people already have.. as of now.. the cell phones models are not important.. i just want to tweak them for my purpose


any suggestions, links or books will be very very helpful......

thanks

- Ujjval

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(NT) I'm afraid this is impossible.

In reply to: intercom using cell phones

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(NT) y?

In reply to: I'm afraid this is impossible.

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"y"

In reply to: intercom using cell phones

It's technical why but the reason is simple. The cell "circuits" and radio are not set to talk directly to each other but rely on the "base station." I decline to write about how cell phones work but you can research that at the usual web sites.

http://www.geeks.com/details.asp?InvtId=XTN-XU2100-R&cpc=SUGG shows the usual business radio units that work up to a few miles.

Bob

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