"privatizing" phones?

[Brendon Macaraeg]

Cpunks:

While shopping for a new phone recently, I came across
two models (Toshiba and Uniden I believe) that
have buttons to "privatize" you conversations. These
were on no-cord models. Does anyone have any idea
on what these actually do? Can the phones  change
 the frequency the call is on randomly
so people can't tune into it? I know cellulars offer something
similar. Personally, I would never put much faith into
something of this sort. 

-B
========================================
Brendon Macaraeg
http://www.itp.tsoa.nyu.edu/~brendonm
Finger macaragb at acf2.nyu.edu for PGP Public Key