Most of the time 911 has to go through an assortment of hoops to get that data. I've had to have them track down a couple of suicides based only on a cell phone number off the caller ID. It's a pain in the ass when you're trying to save some dumbass' life, because the 911 dispatch supervisor has to send paperwork to the cell carrier before the carrier will release the information, and with number portability, the original carrier for the number might not have the data you need.
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