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Carriers still have too many dead zones where e911 services will simply not work. For public safety reasons the FCC should be mandating that carriers address this issue first and require them to have more transparency. Deadcellzones.com has a database of over 100,000+ locations where cell phone users could be compromised in an emergency.

AT&T's cellular towers track the position of callers either by using tower triangulation or by using the phone's internal GPS, enabling the network to report the caller's current position to the "Public Safety Answering Point" where 911 operators handle calls. If the cell phone users has no signal than this method simply does not work. Here is an example map that Southern Link Wireless has kindly provided that should be required from all carriers down to the street level:

in reference to:
"AT&T's cellular call towers track the position of callers either by using tower triangulation or by using the phone's internal GPS, enabling the network to report the caller's current position to the "Public Safety Answering Point" where 911 operators handle calls."
- AppleInsider | AT&T: 3G MicroCell rollout advancing, held up by E911 rules (view on Google Sidewiki)

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