Called my phone tonight too. I live in 425 area code. I called it back and just received a busy signal. I later called the number back at 12:30AM (after midnight) and still got a busy signal. Don't answer the phone.
Like zoo, we are in 425 area code. Phone rang this morning before 10:00. Did not answer unidentified call. No message. This site has been very helpful over time. Thanks to everyone who posts here.
This is an inbound international number from some VOIP or dial-around provider (like Vonage). It's perfectly legitimate. Friends from the UK call us and this is the caller ID we get.