The 911 system was originally designed for landline telephones, transmitting your call and your location instantly over a hard-wired connection.
Today’s cellphone system is not designed to automatically send location data when you dial 911. After the call comes in, the dispatcher’s computer transmits a digital request to the cellphone network seeking to find the phone’s location. The data exchange has to go through a process that can take seconds or even minutes. Sometimes, it doesn’t return a location at all.
REFERENCE AND FULL ARTICLE
911’s deadly flaw: Lack of location data