See suspicious activity (people in the parking lot looking in cars; strangers loitering where you need to go and you feel frightened; you come home to an open door and you're afraid to go inside). If you have a "gut feeling" you should be talking to the police, call.
When the 911 dispatcher answers, he/she will ask what you are reporting. If it's a non-emergency, say so, then answer the questions. Let the dispatcher lead the conversation, as they are looking for very specific information and need to keep lines clear and use the telephone time efficiently. They are most likely dispatching emergency personnel as you speak if the situation warrants.
Enhanced 911 provides emergency operators with a computer display of the name, address, and the telephone number of the registered owner of the telephone being used for the call.
What to Do in a Medical Emergency
In a medical emergency, seconds count. Emergency personnel will be sent as quickly as possible. 911 personnel can offer specific instructions like CPR, Heimlich Maneuver, and childbirth to help until medical personnel arrive. To determine an appropriate emergency medical response, you may be asked:
We Hope You Never Need 9-1-1, But If You Do...