It doesn't need to work in basements, etc. It only needs to keep a record of the last location it was at when the signal faded away. The emergency service vehicles probably can't get any closer than that anyway.
In the US, that might be true, but, I'm betting that could be very wrong in places like London. I'm betting the station where you boarded the Tube could be a LONG way from where you make the 911 call. Owen -- If this message was not signed with gpg key 0FE2AA3D, it's probably a forgery.
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