May 20, 2007
See this thread too: http://800notes.com/Phone.aspx/1-310-388-8021/2#pKx_o1FWz_gClnQjJaHBMCA
I can only guess that they are spoofing other people's numbers.
These are some of their other numbers:
888-279-6049, 888-279-6050, 888-279-6051, 888-279-6052, 888-279-6053, 888-279-6054, 888-279-6055, 888-279-6056, 888-279-6057, 888-279-6058, and 888-279-6059