Terry Streeter wrote :
> Trevor wrote:
>> *** I'm not so certain about the <20 years> because your mobile has already
>> got the [dis]advantage of being easily traced down to the local cell unless
>> you habitually turn it off when not making calls; the software already
>> exists and the PTB already use this facility to trace/track people they are
>> interested in :-(
>
> Actually, it's crucial to the operation of a mobile phone network that
> the network 'knows' in which cell every single mobile is, otherwise the
> network would be unable* to establish an incoming call to the mobile.
> What typically happens is that your mobile calls the network every six
> minutes to tell the network which cell it is in and a whole bunch of
> other information such as the signal strength of surrounding cells.
A friend of mine who is a paramedic was able to guide the Air ambulance
to an injured man out on the marshes by this method. The chap had taken
a fall and dialled the emergency services. By him keeping his phone on
they were able to get a good idea where he was.
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