Roadside mobile phone detectors

[Dan B]

But it allows the network to prove that it was actually in use, and which way the call was going at the time. Its also how they use the mobile network to track your mobile. Automatic network selection is a constant seeking out of the strongest signal. But as the towers/masts are in fixed known locations, triangulation is easy. See the Volvo cyclist detection system, good for within nine feet.

I think we're talking about different things. I dont dispute that automatic network selection might do what you say it does, but I would be surprised if manual network selection caused you to be locked to a particular tower - it just limits you to towers controlled by a particular network.

 

[classic33]

I think we're talking about different things. I dont dispute that automatic network selection might do what you say it does, but I would be surprised if manual network selection caused you to be locked to a particular tower - it just limits you to towers controlled by a particular network.

As does manual. But its the constant stream of information sent to & from the handset that automatic selection that makes triangulation easier.
Its one reason that maps are available on current handsets.

 

[Silvio Diego]

technology behind seems to be completely rubbish...

 

[marzjennings]

technology behind seems to be completely rubbish...

I think they re-used the same technology used in old TV detector vans.