Who called from 2061234567

Call came in on cell -- don't know the number so not answered.  I'm on Do Not Call List as well.

This call came in on my cell don't know this number  206-123-4567

These jerks need to get a life, atleast some of us are trying to have one.

This number shows up in my messages everyday but I don't receive an actual message ever? I don't recall ever having received a phone call.. It's weird there's no message, but the number is in my inbox and every day a few times a day, I see that the message time changes? So I noticed this morning the message said I received it at 05:06 and now just there the message said I received it at 14.32.. Kind of freaked out. I live in Ireland how and why do they have my number?