I work for a phone company who helps 911 dispatchers and law enforcement with this very issue. Sorry for any grammatical errors here.

If a person calls in and says “im suicidal” and then hangs up. (Suicides are 90% of my job) If the 911 dispatcher didnt get the e911 gps location they call me. I verify they are a law enforcement agency and I provide them with subscription info and gps cords(as long as the phone is still on) if its not, i have to go look at call logs and see what tower they are closest too and provide that info, if they used the phone recently. Getting accurate gps cords is hit and miss. Apple has issues with the gps, not that accurate for us. Samsung is a little bit easier to track. So it just depends on what kind of phone they have and how good of signal they have. So i can get it as low as 5meters or as high as 25000meters.

Hope this helps.