Apparently, they've used 360-449-9731 in the past.

I got an unsolicited SMS from weRmp3.com:

Fwd:Fwd: February only
weRmps3.com has music for
only 8cents a song! Over 5
Million songs to choose from!
Go now weRmp3.com!  Better
than iTunes & works w/IPOD

I just received a text from the above-mentioned phone # regarding weRMP3.com.  I do not subscribe to this, and get charged everytime I receive a text.  Please do not text my number anymore!