[UA] Our modern mobile world

[Will]

Myles Corcoran <myles at irls3101.ck.cit.alcatel.fr> a écrit :
>
> As as GSM phone software guy I thought I'd answer this one.

Good idea! I have a few precisions & questions...

> There's new recommendations coming in that 
> will make it possible (for the police mainly) to pinpoint a 
> mobile to within about 100 metres, depending on the cell size 
> in your area. Less population density, lower accuracy. 

The way it works (I guess it also depends on technology) is like a hive of
cells, and they can detect in which cell you were. The thing is, there are
more cells where operators expect more calls (cities, highways, ski
resorts, ...) and less cells where they expect none (in the middle of nowhere,
wherever it is). And more cells implies smaller cells, so normally they can
find you quite accurately in cities, and much less accurately in the
countryside.


> > 4. Answering machine-style services. Are they common, or standard? What
> >    info, if any, do they tell you about the caller? Can the network
> >    provider find out more?

Since the message is stored on a machine from the operator, I guess the
operator has an access to the content of this message...

> 	National roaming, as it's called, works pretty well in 
> most industrialized nations. Except, curiously, in the US. This 
> is because of the difference in mobile standards. Europe and lot 
> of Asia and Africa use GSM. The States uses CDMA.

I think some manufacturers worked on bi-bands handsets, allowing you to
call almost anywhere in the world. I'm pretty sure Nokia did one.

Will

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