I got a call, answered, it was a recorded message from someone trying to sell health insurance (actually, it sounded more like a health version of those dental savings plans that offer reduced prices but are not insurance).
I listened to the whole thing then pressed 9 to be removed from the contact list, but there was no confirmation, it just went silent and when I looked at the phone again, the call had ended.
Unfortunately, it appears this number may belong to a real estate agent in Washington, so it's most likely a spoofed number.
http://www.realestatemarketplc.com/about/our-agents/michelle-pharr/