> A remote enabled DF-able transmitter on the person that can be used to
> find and trace the person for example, once you know the cell
> he is in,
> probably for days, or as long as the battery lasts, or longer
> if he keeps
> it charged all the time. This can be done by the good guys or the bad
> guys.

OK, so the ping enables that particular mobile for the duration of the
check...  And it is transmitting on the same frequency as every other mobile
on that cell.  And you need to be in the same country, in the same cell (or
within appreciable range of that cell)... Which makes DF a little more
tricky at best.

*If*, of course, it isn't just managing a query to the provider's database
to see whether the phone is active in a cell...  Home Location
Register/Visitor Location Register etc.  I'm not sure the providers would go
for a system that would duplicate what is already done to track the location
of mobiles in cells.

There are still easier ways to get a more accurate location out of someone
with a phone switched on - they usually require the assistance/coercion of
the particular provider in the country the phone is in, however.

Privacy?  What's that then?

Peter

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