Who called from 2064456048

Called my unpublished cell phone.  Every time I try and call them back it connects and then hangs up after four seconds.

got a call from this number but they hung up when i answered

got call from 206-445-6048 --- no one there  5-28-2010 11:50 AM

I sent my friend a text message and it came through on his phone as 206-445-6048, which comes from a completely different state and city than were my number is based from

This number came to my home phone, with the Caller ID listing it as "Service Message." I thought it might be a message from school or appointment reminder or something. I always let those go to VM. This one didn't leave any message, though. I thought it was rather curious...