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Old 18-02-2008   #26
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Just recalling something prompted by Simbas post.

A few years ago I was told that mobile phones had an internal code that could be used by the emergency services to trace activity (triangulation within cells). Additionally if the phone was registered with a valid address it could be used to make emergency calls without a Sim card.

Now that 1984 has passed it wouldn't surprise me that the authorities might be utilising the location aspect on potential suspects, and the witheld number system may be overridden in certain cases.
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Old 18-02-2008   #27
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Triangulation is easy enough - unless you are in a very remote area the phone will be picked up on 3 or 4 phone masts. Then its an easy job to work out where it is from the time delays at each mast - the more masts its picked up on the better the triangulation
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