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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

Comments

  • zibadianzibadian Posts: 6,349Member
    : 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
    :
    It might be possible, but that would involve breaking and rebuilding the phone processor. Practically it is not possible, because nearly all the electronics are embedded into ic's.
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