I keep receiving phone calls from this number to my home cell phone. They never leave a message. I'm out of the country so I'm not using that phone. They obviously don't know that I'm gone because they keep calling at 4am. I don't want to waste my minutes on my international phone to call this number back if they don't even have the courtesy or urgency to leave a message. A message from them at least to let me know who they are would be helpful!

I know it's from Springfield, Illlinois, but I can't figure out if it's a landline or cell phone.

Any ideas?

its the blood bank reminding you of your eligibility to donate again. I always mark it on my calendar so i'm going to ask them not to call next time I go in.

This is the Central IL Community Blood Bank - mostly they would call you with requests to come back in for a donation when they are running low, or reminders if you are scheduled.