All I get when I call this number is a busy signal. They call several times a day. I'm pretty sure they are a bill collector of some sort.

medical billing company

I just got a call from this number to my cell phone...what's up with that?  And no message as well.

I have gotten calls from this number for the past few weeks. They call all day long, sometimes 4 or 5 times in a row. I have never answered because I don't answer numbers I am not familiar with. When I called the number back, they said "Thank You for calling PRI, my name is xxx how may I help you?" I hung up the phone.
I do not owe on any kind of medical bills, or and other bills for that matter. Does anyone know how I can get them to stop calling me?

This number belongs to PRI (also known as Premier - a debt collection agency according to the person who answered the phone)  

As it turns out, they were calling for someone who has the same last name as mine.  When I pressed further as to how they located me, I was told that they may may have found me due to proximity and same last name. I asked if they used the phone book, she said she couldn't help me further and had to get back to work and that she did remove my number.  

I have had this telephone number for over 30 years, this sounds like a fishing expedition or a verification that I have this number.  

It's all about them, isn't it?  Nobody is here for us.

This phone number has continually called my home numerous times daily. The caller ID shows as "Unknown Name". When I answer it, the theme music for the old TV show "National Geographic" plays and no person or recording ever says anything. I have reported this number to my state's attorney general under Missouri's "No Call List" law as a violation. Our attorney general (Jay Nixon) is natoriously ruthless in favor of consumer rights and going after telemarketers not complying with the "No Call List". A google search shows this area code number to be out of the Lexington, KY area.

keeps calling