So I was thinking -- what if the iPhone used my location to figure out where my 911 call should be routed? This would be extremely handy in California, where all mobile 911 calls go to highway patrol. My local police department has a 10-digit emergency number for calling from a cellphone, however. Imagine this: I'm in Vacaville. I see someone having trauma. I tell Siri to call 911. If the phone determines that the traumatic person probably isn't on the highway (this fact would be determined by looking at the GPS data), the phone will call the Vacaville PD. If the trauma could be on the highway, the phone will call CHP.