IP: why is your cellphone silent

[Dave Farber <farber () cis upenn edu>]

C-GUARD CUTS NUISANCE CELL PHONE CALLS
Using technology developed by the Israeli military, Netline Technologies has
developed a device that eliminates cell phone traffic in designated areas
such as movie theaters, concert halls and university lecture rooms.  C-Guard
is currently in beta testing in Israel, and Netline hopes to begin shipping
the product by the end of the year.  "What we basically do is to prevent the
handshake between the handset and the base station in a designated area,"
says the company's general manager.  This is accomplished by transmitting a
low-power signal to the handset to prevent any effective communication with
the nearest base station.  The device could also be used in places like
hospitals, laboratories and airplanes.  (TechWeb 22 Apr 98)