I have received calls from this number as well (405-395-4712). Read the above posts and now blocking it. It is annoying and I know it comes from out of Shawnee, Oklahoma. And approximate area.
I was on the phone with someone else when this number rang in but I didn't switch in time. Against my better judgement, I called back and was greeted by "I'm sorry this mail box is full, please call back later". I don't think so... especially now that I have read others comments.