TELECOM Digest OnLine - Sorted: Re: Where to Buy a Cellular Phone Jammer?

Re: Where to Buy a Cellular Phone Jammer?

Clark W. Griswold, Jr. (
Mon, 27 Jun 2005 07:41:35 -0600

Bruce L. Bergman <blPYTHONbergman@earthlink.invalid> wrote:

> Jamming wouldn't be very effective. They would have to block the
> entire 800, 900, 1800 and 1900 MHz bands to get all cellulars

Actually, it's not all that hard. Even though there are hundreds of
channels in those frequency bands, there are relatively few control
channels. All you need to do is block the control channels and you
prevent the phone from operating.

There is another technique that is somewhat more elegant -- spoofing
the tower. Since cell phones will latch onto the strongest signal,
you just need a signal that is slightly stronger than the towers in
the area. That signal has enough of the correct protocol behind it
that the phone uses it and doesn't connect to the real system.

This is a variation on the pico-cell concept that they are talking
about for aircraft, subways, etc.

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