--- In [email protected], Terry Streeter <[EMAIL PROTECTED]> wrote: > > 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. > When there is an incoming call the network broadcasts a message in the > last known cell and likely surrounding cells to try to locate the mobile. > > Even turning the phone off doesn't really help you, as the moment you > turn it on to make a call it tells the network exactly where it is.
Many of the newer Blackberrys that are connected to a corporate BES (Blackberry Enterprise Server) are capable of doing exactly what's been mentioned, i.e using their built-in GPS receiver to report back to the BES exactly where the handset is to within a few metres. -- David
