Caller ID just says:  Cambridge, MN and the number.  They called many times from 763-200-6592.  I blocked that number and now they are calling from 763-200-9545.  I assume it is from the same people.  If they are trying to collect on old credit card debt they are barking up the wrong tree.  I've never been late on a credit card payment in over  50 years.  I just resent getting these calls and interrupting my day.  I never pick up from a person, place or number that is not familiar to me.  If they continue to call I block the number.  I post to 800Notes just to find out what others know about the caller and to add any information I may have.  We can't rely on the Federal Do Not Call Registry.  It has too many loopholes.  As they say, "knowledge is power".