Re: Anonymous phone calls (was: What is the EFF doing exactly?)

At 10:08 AM 9/6/96 EST, jbugden@smtplink.alis.ca wrote:
>There is another spin possible on the reasons for replacement of pay phones with
>credit card phones. In Canada all new credit card phones are also able to take
>phone cards (which are anonymous).

Don't be too sure about the "anonymity" of these cards.  You don't have to 
give your name when you buy or use them, but assuming a large number of 
phone calls (to, from different locations) can be associated together after 
the fact, your name can probably be fairly easily obtained.
Jim Bell
jimbell@pacifier.com

On Fri, 6 Sep 1996, jim bell wrote:

> At 10:08 AM 9/6/96 EST, jbugden@smtplink.alis.ca wrote:
> >There is another spin possible on the reasons for replacement of pay phones with
> >credit card phones. In Canada all new credit card phones are also able to take
> >phone cards (which are anonymous).
> 
> Don't be too sure about the "anonymity" of these cards.  You don't have to 
> give your name when you buy or use them, but assuming a large number of 
> phone calls (to, from different locations) can be associated together after 
> the fact, your name can probably be fairly easily obtained.
> Jim Bell
> jimbell@pacifier.com

And phone companys that offers phone cards keep track of every call that 
goes thru each card number.