I could be wrong about this, but I think that HIPAA rules prohibit the leaving of really informative messages in a medical emergency. I think that these days you won't get a message from someone saying something like, "Hello, this is nurse Ratched at the County General Emergency room. We have a patient who has been in an car accident and listed the number as his emergency contact. The driver's license he was carrying says his name is John Smith." I suspect what you would get is: "Hello, I'm calling from County General hospital. Please return this call as soon as possible at ###-####."
I don't have long-distance service on my landline phone, and my cell is a prepaid that is .25/minute. For that reason this household uses calling cards for all long-distance social-type calls. You may not realize this, but the calling card will show a number on a caller ID, and it will show the geographic location of the company that issued the card. I use AT&T cards that generally show the number I'm calling from as being in either Denver or Dallas, and the number changes every time I use it. I'm perfectly willing to pay for that phone call, but if you don't answer the phone you'll end up either a) not bothering to return the call since you don't recognize the number, or b) paying for the call because you'll have to call me back on your dime.
Now, I realize that many people have unlimited long distance on cell phones, but not everyone does. Please keep that in mind, and pay attention to the number that is left in the message. I really don't appreciate it when people who have my cell number call it even though it is NOT the number I left in the message. I always leave my landline phone number in the message unless I'm calling about something urgent that needs a response right away when I'm away from home. If I leave you a number, please use the number I leave.