If I hadn't moved the SIM in my phone into another phone they don't support I could try this.
http://www.askbjoernhansen.com/archives/2002/09/12/000145.html
Since one year ago it is available in Spain. When I ask for a close live music bar, it says there is one at 300m. It is actually at 200m from home.
Presumably built on the E911 requirement.
Also because there is a strong commercial interest in "proximity services", from pizza restaurants to "chat with neighbouring people".
This has been a very hot market for the phone companies. In Spain they have to face legal issues, so you are required to confirm explicitly each time they are going to give your position to someone (via WAP or SMS), except for the emergency services and Police when they have a grant from a judge. It is not heavily used, though, since phone companies want tremandous money (to be paid by the consumer, crazy) just for receiveing advertising from the neighbour pizza. Something like �0.5 (this funny symbol is Euro, for the eighth-bit chalenged).
So, any GSM phone in Spain (I think in most/all of Europe), can be located to 50/300meters simply measuring the relative signal strengths from different base stations that it receives.
Regards,
Santiago
- ben
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