I think this is some kind of telemarketing scheme.  They call, don't leave a message.  I've tried calling back several times only to be met with a busy signal.  Lots of companies using false caller IDs these days it seems.  All they have listed is the city or state of origin of the area code rather than the full disclosure they are supposed to have.

They called twice today. Don't know who this is.

got the same call, answered, but no one on the other end...what the deal?

same here... got the call 3 minutes ago.  they claimed they were washington mutual.. they know so much info about me.  wth????

it could be wamu. do any of the previous posters have wamu?