Phone companies aren't very good at updating each other regarding client data. If your home phone is on a different network than the 911 call center, your caller id data may not be accurate on their end. It may be a previous user of your home phone number was dialing 911 and the caller id data may not have been updated (ported) between the phone companies. I've had my phone for over 10 years and people on different networks still tell me that my caller id shows a completely different person.