Calls during my business hours to my cell phone number. I can't take the calls and they all go to the voice mail, but the caller never leaves messages. I am not spending my minutes by calling this number back. If the call would be of any importance to me, they would leave message!
Must be some telemarket/survey related thing ... maybe based in Iowa ... I've received calls from same area code/prefix too ... same description you gave .. only difference is last 2 digits of the number above was 67. Definitely don't call back just in case it's one of those new $100/per minute scams