Perhaps the tube wasn't the best example, although, I remember making cell calls from places in stations I'm pretty sure I wouldn't have gotten GPS coverage.
In any case, the fundamental assumption that detailed location information for e911 on every phone or phone-like capability is desirable is, in my opinion, flawed. I understand why the police-state zealots at places like the FBI want it, but, I'm not sure why network operators are so anxious to solve this problem. Personally, I'm perfectly happy that my laptop and it's SIP soft-phone aren't location traceable at all times. Owen
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