911 dispatchers know much more about who (and from where is calling) they you would expect.<p>They know which cell tower received the call (that is why calling 911 in a city that isn't your own directs you to the 'local' police) and have access to related metadata.<p>Next, they have stored data about the number calling (e.g., this number called three times in the last month about someone blocking her driveway).<p>That they don't have access GPS or other functions on your device is a feature, not a bug.