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intercom using cell phones

by ujjvalshah / July 7, 2007 8:21 PM PDT

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.
by Kees Bakker / July 7, 2007 9:41 PM PDT
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(NT) y?
by ujjvalshah / July 7, 2007 10:24 PM PDT
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"y"
by R. Proffitt Forum moderator / July 8, 2007 12:55 AM PDT

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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