This number (989 732-0439) came up as a missed call on my new mobile phone. I only got this phone and the new number a few days ago and so far I have only given the number to a couple of friends who have not passed it on to anybody. I'm guessing the caller got my number directly from AT&T?
Automated dialers can be set to call any group of numbers, and they can "spoof" to make it appear it comes from any number. The lady/ladies who have that number registered to them might be completely innocent.
It seems as though they've somehow been able to get a list of prefixes that are cell prefixes since that seems to be what they're getting.
Either way, everyone needs to file an FCC complaint so they'll take action. File your complaint here: http://esupport.fcc.gov/complaints.htm