Who called from 6042480604

Just a one ring call with no message. Thought this was weird coming from Canada.

Call from Canada. Rang twice. My phone number is unlisted, so I am wondering who this is and how they got my phone number.

i'm unlisted and they called me twice this week,just said british colubia

Was made as an outgoing call on my cellphone, an international call for me.
It was posted on my bill as copied.

Item Day Date Time Number Called Call To Min Rate Code Rate Pd Feature LD/DA
Charge Charge
110  WED  07/25/2007  10:45AM  604-248-0604  RICHMOND BC  1  RM21  DT  0.00  0.20  0.20

This is copied from my AT&T Wireless phone bill(PDF)

Hey
This characters called me on my cell phone here in Mercer Island Wa
trying to sell me some real estate crap.
My cell phone number 425-444-0281 is unlisted can you believe they even got my full name ?