I called the number back anonymously and got the following message after a lengthy ring span, "The subscriber you've dialed is outside the subscription area."

I called back a minute or two later, and a female answered using a foreign language--it sounded Mexican/Spanish). I don't know whether or not this is a scammer or someone who is legitimately confused on the number they're dialing. I do know they're strangers, and I'm not going to expose my personal information--even if I did speak the language.